Question

shikha is 20 years old and reema is 4years old.In how many years shikha will be twice as old as Reena?

Answer 1

Sol:
Age of Shikha = 20 yrs
Age of Reema = 4 yrs

Let the number of years after which Shikha will be twice as old as Reema be 'x'.

(20 + x) = 2(4 + x)
20 + x = 8 + 2x
20 - 8 = 2x - x
12 = x

Therefore, Shikha will be twice as old as Reema after 12 years.

Answer 2

Let the number of years be x

,

In x years time:

Shikha = 20 + x

Reena = 4 + x

.

In x years time, Shikha will be will twice as old as Reena:

20 + x = 2( 4 + x)

.

Solve x:

20 + x = 2( 4 + x)

20 + x = 8 + 2x

2x - x = 20 - 8

x = 12

.

Answer: In 12 years time, Shikha will be twice as old as Reena.