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# if 2+9=711 then find 12+3=??? number Puzzle with answer

Home » Puzzles » if 2+9=711 then find 12+3=??? number Puzzle with answer

## Puzzle with answer:  If 2+9=711; 14+6=820; 17+11=628; then solve the equation 12+3=???

### Solution:

if you look at the question we have equations as

2+9=711

14+6=820;

17+11=628

then 12+3=??

from Equation 1

2+9=711

2+9=(2-9)(2+9)

= 711

here we used a formula called a+b=(a-b)(a+b)

similarly for remainng equations

Equation:2

14+6=(14-6)(14+6)=820

Equation:3

17+11=(17-11)(17+11)=628

now we have 12+3=??

12+3=(12-3)(12+3)=915

#### 12+3=915 is the correct answer

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