Brain Twister Puzzle

Level 2

2+3=8, 3+7=27, 4+5=32, 5+8=60, 6+7=72, 7+8=??

Solve it?


The answer is 98.

Jiang Rong Lim by Jiang Rong Lim , 36, Malaysia

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5 solutions

The general can be represented by T n = a × n + a × b . t h e r e f o r e t h e l a s t t e r m i s 7 × 6 + 8 × 7 = 98 Tn=a \times n+a \times b. therefore the last term is 7 \times 6+8 \times 7=98

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weird question

Z K - 7 years, 3 months ago

I don't know why, but I was able to identify it in different approach...

Dawoud Shakhsheer - 7 years, 4 months ago

2 3+2=6,3 7+6=27 it says that if we multiply two no.and add 2,6,12,20,30,42 will get the solution that is 98

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continue from 3*7+6=27

Sashikanta Subudhi - 7 years, 3 months ago
Jitendra Kumar
Feb 18, 2014

2+3=2 1+3 2 3+7=3 2+7 3 4+5=4 3+5 4

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in this sum if it is x+y, it follows xy +a and the a is first time 2, second time 4 ,that is ,a is incremented by 2 in every step giving the final answer 98.

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Jiang Rong Lim
Jan 27, 2014

2+3=2 [3+(2-1)]=8 3+7=3 [7+(3-1)]=27 4+5=4 [5+(4-1)]=32 5+8=5 [8+(5-1)]=60 6+7=6 [7+(6-1)]=72 therefore 7+8=7 [8+(7-1)]=98 x+y=x[y+(x-1)]=x^2+xy-x

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