Question

if A is older than B by 20 years, in 15 years A will be be 1.5 time B's age, find their age ​

Answer 1

Step-by-step explanation:

GIVEN,

A is older than B by 20 years => B+20 = A

in 15 years A will be be 1.5 time B's age => A+15 = 1.5B

FROM ABOVE,

B+20 + 15 = 1.5B

=> 1.5B-B = 35

=> 0.5B = 35

=> B = 350/5

=> B = 70

BY SUBSTITUTING THE VALUE OF B IN 1ST EQUATION, WE GET

=> A= B+20

=> A= 70+20

=> A= 90

Answer 2

Answer:

Age of A is 90yr n age of B is 70 yr

Step-by-step explanation:

let age of A be x

and age of B be y

y=x-20.... equation 1

x+15=1.5y....equation 2

subtract equation 2 from 1

x- y= 20

- x- 1.5y = -15

+. +

0.5y = 35

therefore, y= 35/0.5

= 70

substitute value of y in equation 1

x- 70=20

x= 20+70

x= 90

Therefore, age of A is 90yr n age of B is 70yr