Question

4397. If (a + b) =15 and (a - b) = 10,
then b=?​

Answer 1

hey nae here is your ans

a+b= 15

a-b= 10

by elimination method

2a= 25

a= 25/2 = 12.5

and we know that a+b= 15

b= 15-12.5 = 2.5

hope it help u

Answer 2

Answer:

a-b=10 1 equation

a+b=15 2 equation

then , a = 10 + b from 1 we get 3 equation

and converting the value of equation 3 into 2 equation

it will become

10 + b + b=15

10 + 2b =15

2b = 15 - 10

2b = 5

b = 5/2

Hence find