## Poll

22 members have voted

ThatDonGuy
Joined: Jun 22, 2011
• Posts: 2969
January 10th, 2017 at 6:36:27 PM permalink

The solution to each equation is the product of the two numbers plus the smaller one. The order of the equations is irrelevant.
1 x 4 + 1 = 5
2 x 5 + 2 = 12
3 x 6 + 3 = 21
8 x 11 + 8 = 96

RS
Joined: Feb 11, 2014
• Posts: 5352
January 10th, 2017 at 11:53:51 PM permalink
Using the subtotal method:
x+y = f(x,y) = SUM[x, y, f(x-1, y-1)] where X > 0 OR Y > 0

-3+0 = -3
-2+1 = -1-3 = -4
-1+2 = 1-4 = -3
0+3 = 3-3 = 0
1+4 = 5+0 = 5
2+5 = 7+5 = 12
3+6 = 9+12 = 21
4+7 = 11+21 = 32
5+8 = 13+32 = 45
6+9 = 15+45 = 60
7+10 = 17+60 = 77
8+11 = 19+77 = 96

Using f(x,y) = x*(y+1) method:
f(8,11) = 8*(11+1) = 8*12 = 96

Like ME said -- there are many formulas that lead to the same answer....or that at least follow the pattern.

BTW, 5 does not exist in base 5.

5 in decimal is 10 in base-5: 1*5^1 + 0*5^0 Just like 2 in decimal is 10.
"should of played 'Go Fish' today ya peasant" -typoontrav
MaxPen
Joined: Feb 4, 2015
• Posts: 1048
January 11th, 2017 at 10:16:02 PM permalink
I think people are overthinking the problem. Sometimes you just have to strike the nail on the head. The answer is 40. Just my opinion.
odiousgambit
Joined: Nov 9, 2009
• Posts: 7296
January 12th, 2017 at 6:44:07 AM permalink
if there is no official answer, then this math exercise is perfect for the Millennials. Everybody is right and and we all get a trophy for participating!
"Baccarat is a game whereby the croupier gathers in money with a flexible sculling oar, then rakes it home. If I could have borrowed his oar I would have stayed." .......... Mark Twain
Romes
Joined: Jul 22, 2014
• Posts: 4127
January 12th, 2017 at 6:50:39 AM permalink
Quote: odiousgambit

if there is no official answer, then this math exercise is perfect for the Millennials. Everybody is right and and we all get a trophy for participating!

Playing it correctly means you've already won.
Wizard
Joined: Oct 14, 2009
• Posts: 16346
January 12th, 2017 at 8:37:44 AM permalink

96.

Each number of the right side of the equation equals x*(y+1), where x is the first number and y is the second.

8*(11+1) = 96
It's not whether you win or lose; it's whether or not you had a good bet.
IndyJeffrey
Joined: Feb 10, 2013
• Posts: 93
January 12th, 2017 at 8:40:07 AM permalink
Quote: RS

Using the subtotal method:
x+y = f(x,y) = SUM[x, y, f(x-1, y-1)] where X > 0 OR Y > 0

-3+0 = -3
-2+1 = -1-3 = -4
-1+2 = 1-4 = -3
0+3 = 3-3 = 0
1+4 = 5+0 = 5
2+5 = 7+5 = 12
3+6 = 9+12 = 21
4+7 = 11+21 = 32
5+8 = 13+32 = 45
6+9 = 15+45 = 60
7+10 = 17+60 = 77
8+11 = 19+77 = 96

Using f(x,y) = x*(y+1) method:
f(8,11) = 8*(11+1) = 8*12 = 96

Like ME said -- there are many formulas that lead to the same answer....or that at least follow the pattern.

Thanks for making me feel less than knowledgable. I just looked for a pattern and came up with 96.
odiousgambit
Joined: Nov 9, 2009
• Posts: 7296
January 13th, 2017 at 3:32:13 AM permalink
Quote: Romes