trippy math question

Ku-sama · 11-06-2009, 04:46 PM

1. First pick the number of times a week that you would like to go out to eat (more than once but less than 10).
2. Multiply this number by two.
3. Add five.
4. Multiply by fifty.
5. If you have already had your birthday this year add 1759. If you haven’t, add 1758.
6. Subtract the four digit year you were born.

You should have a three digit number.
The first digit of this was your original number (i.e., how many times you want to go out to eat in a week).
The next two numbers are your age.

Recklesss · 11-06-2009, 06:38 PM

what.....the......fack.......

Ku-sama · 11-06-2009, 07:01 PM

it will work with any number 1-9.

MR JAS · 11-06-2009, 08:17 PM

lol doesnt work if your 108 years old

como · 11-06-2009, 08:48 PM

I retract my statement

Beau Corso · 11-08-2009, 01:46 PM

i eat out every day...

oh, you mean actual food?

mr2magic · 11-08-2009, 01:50 PM

1. Let a and b be equal non-zero quantities

a = b

2. Multiply through by a

a^2 = ab

3. Subtract b^2

a^2 - b^2 = ab - b^2

4. Factor both sides

(a - b)(a + b) = b(a - b)

5. Divide out (a - b)

a + b = b

6. Observing that a = b

b + b = b

7. Combine like terms on the left

2b = b

8. Divide by the non-zero b

2 = 1 \,

Ku-sama · 11-08-2009, 02:04 PM

First, you should notice that this puzzle has nothing to do with the number of times that you’d like to eat out every week. You could ask a person to randomly pick a number between 1 and 9 (including 1 and 9) and the puzzle would work out the same way.

If we go through step by step here’s why this works:

1. Let’s call the number that you initially pick x. It’s important to the puzzle that this number be between 1 and 9, including 1 and 9. You cannot pick 10. After we go through the explanation of the problem you should quiz yourself and ask why you cannot pick 10.

2. Multiply your number by 2. Now we have 2x.

3. Add 5 to this number. Now we have 2x + 5.

4. Multiply this number by 50. Now we have (50)(2x + 5). If we multiply this out we have 100x + 250.

5. Let’s assume that you’ve already had your birthday this year. According to the puzzle we should next add 1757 to our number. So we have (100x + 250) + 1757. Again, if we simplify we get 100x + 2007. Notice that the second half of this equation (after the plus sign) is the four digit year. Once we’re done with the puzzle you should ask yourself why we only add 1756 if we haven’t had our birthday yet this year.

6. At this point we’re supposed to subtract our four digit year of birth from our number. Since I was born in 1981 I’ll subtract this number. So our number is now (100x + 2007) – 1981. Simplifying, we get 100x + 26. This final equation is split into two parts. The second part (after the plus sign) will be your age. I am 26 years old. This is correct. The first part of the equation will be a multiple of 100, and will always be a three digit number. In other words, if you consider the three individual digits of this number, it will always be digit x followed by two digits of 0. So the number represented by the first part of this equation will basically be the number x00, if that makes sense. If you add 26 (or whatever your age is) to x00, you’ll always get x26.

The first digit will always be the number of times you’d like to eat out every week and the last two digits will be your age. And there’s the answer!

11-06-2009, 04:46 PM	#1 (permalink)
Ku-sama Cage Fighter Join Date: Mar 2008 Location: Germantown, MD Posts: 1,462 Thanks: 8 Thanked 31 Times in 31 Posts My Google Map iTrader Rating: (2/100% )	trippy math question 1. First pick the number of times a week that you would like to go out to eat (more than once but less than 10). 2. Multiply this number by two. 3. Add five. 4. Multiply by fifty. 5. If you have already had your birthday this year add 1759. If you haven’t, add 1758. 6. Subtract the four digit year you were born. You should have a three digit number. The first digit of this was your original number (i.e., how many times you want to go out to eat in a week). The next two numbers are your age.

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11-06-2009, 06:38 PM	#2 (permalink)
Recklesss Ruler of Signatures Join Date: Jan 2008 Location: Oregon Posts: 359 Thanks: 6 Thanked 7 Times in 6 Posts iTrader Rating: (0/0% )	what.....the......fack.......

11-06-2009, 07:01 PM	#3 (permalink)
Ku-sama Cage Fighter Join Date: Mar 2008 Location: Germantown, MD Posts: 1,462 Thanks: 8 Thanked 31 Times in 31 Posts My Google Map iTrader Rating: (2/100% )	it will work with any number 1-9.

11-06-2009, 08:17 PM	#4 (permalink)
MR JAS Always blow on the pie Join Date: Apr 2009 Location: hamilton new zealand Posts: 355 Thanks: 7 Thanked 9 Times in 8 Posts iTrader Rating: (0/0% )	lol doesnt work if your 108 years old

11-06-2009, 08:48 PM	#5 (permalink)
como Road Warrior Join Date: Jan 2009 Location: Southern Maine Posts: 514 Thanks: 13 Thanked 8 Times in 7 Posts iTrader Rating: (2/100% )	I retract my statement

11-08-2009, 01:46 PM	#6 (permalink)
Beau Corso The wolf is coming Join Date: Jun 2005 Location: Pair-o-dice Posts: 159 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	i eat out every day... oh, you mean actual food?

11-08-2009, 01:50 PM	#7 (permalink)
mr2magic deutsch type skillz Join Date: Feb 2008 Location: Hannover, Germany Posts: 926 Thanks: 77 Thanked 36 Times in 33 Posts My Google Map iTrader Rating: (3/100% )	1. Let a and b be equal non-zero quantities a = b 2. Multiply through by a a^2 = ab 3. Subtract b^2 a^2 - b^2 = ab - b^2 4. Factor both sides (a - b)(a + b) = b(a - b) 5. Divide out (a - b) a + b = b 6. Observing that a = b b + b = b 7. Combine like terms on the left 2b = b 8. Divide by the non-zero b 2 = 1 \,

11-08-2009, 02:04 PM	#8 (permalink)
Ku-sama Cage Fighter Join Date: Mar 2008 Location: Germantown, MD Posts: 1,462 Thanks: 8 Thanked 31 Times in 31 Posts My Google Map iTrader Rating: (2/100% )	First, you should notice that this puzzle has nothing to do with the number of times that you’d like to eat out every week. You could ask a person to randomly pick a number between 1 and 9 (including 1 and 9) and the puzzle would work out the same way. If we go through step by step here’s why this works: 1. Let’s call the number that you initially pick x. It’s important to the puzzle that this number be between 1 and 9, including 1 and 9. You cannot pick 10. After we go through the explanation of the problem you should quiz yourself and ask why you cannot pick 10. 2. Multiply your number by 2. Now we have 2x. 3. Add 5 to this number. Now we have 2x + 5. 4. Multiply this number by 50. Now we have (50)(2x + 5). If we multiply this out we have 100x + 250. 5. Let’s assume that you’ve already had your birthday this year. According to the puzzle we should next add 1757 to our number. So we have (100x + 250) + 1757. Again, if we simplify we get 100x + 2007. Notice that the second half of this equation (after the plus sign) is the four digit year. Once we’re done with the puzzle you should ask yourself why we only add 1756 if we haven’t had our birthday yet this year. 6. At this point we’re supposed to subtract our four digit year of birth from our number. Since I was born in 1981 I’ll subtract this number. So our number is now (100x + 2007) – 1981. Simplifying, we get 100x + 26. This final equation is split into two parts. The second part (after the plus sign) will be your age. I am 26 years old. This is correct. The first part of the equation will be a multiple of 100, and will always be a three digit number. In other words, if you consider the three individual digits of this number, it will always be digit x followed by two digits of 0. So the number represented by the first part of this equation will basically be the number x00, if that makes sense. If you add 26 (or whatever your age is) to x00, you’ll always get x26. The first digit will always be the number of times you’d like to eat out every week and the last two digits will be your age. And there’s the answer!