Question

A+b=100,also a-b=80 find a×b=

Answer 1

a+b=180 (1) a -b = 180 a= 80+ b fill value of a in ( 1) 80 + b+ b =180 80+ 2b =180 2b= 180 -80 2b= 100 b= 100÷ 2

Answer 2

Answer:

A+B = 100

A = 100-B ------------- 1

Put 1 in

a-b= 80

100-B- B = 80

-2B = 80-100

-2B = -20

Therefore, B = 10

Put value of B in 1

A = 100-B

A = 100-10

A = 90

Therefore, a X b = 90x10

= 900 ans.

Hope it helps

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