Question

Banu is 20 years older than binu. In 5 years, Banu will be twice as old as binu. Find their present age.

Answer 1

i think Banu is 40 and Binu is 20

Explanation:

if Banu was 35 and Binu was 15, 5 years go by Banu is 40 so still 20 years older and Binu is 20, Binu is half the age of Banu.

Answer 2

ANSWER:

Banu's present age = 45
Binu's present age = 25

Banu's present age is 45 years old while Binu's present age is 25 years old.

Explanation:

We will be using simultaneous equations to solve this problem.

Let's first establish the two equations we will be using to solve this problem.

Let Banu's present age = x

Let Binu's present age = y

Equation No. 1 -

x = y + 20

Equation No. 2 -

x + 5 = 2y

To begin with, as ( x ) is already the subject in the first equation and it is already in its simplest form, we will substitute the value of ( x ) given from the first equation into the second equation to solve for ( y ) accordingly.

Equation No. 2 -

x + 5 = 2y

( y + 20 ) + 5 = 2y

y + 25 = 2y

y - 2y = - 25

- y = - 25

y = 25

From this, we will substitute the value of ( y ) from the second equation into the first equation to solve for ( x ) accordingly.

Equation No. 1 -

x = y + 20

x = ( 25 ) + 20

x = 45