Question

Mala is y years old. Her sister is 4 years older than mala . Write expréssion in simplest form that represents the sum of ages of the sisters .

Answer 1

`2(y+2)`

Explanation:

Let

y --->Mala's age

x---> sister's age

we know that

`x=y+4` ---> equation A

so

The sum of ages of the sisters is

`x+y`

substitute equation A in the expression of the sum of ages

`(y+4)+y=2y+4`

simplify

`2(y+2)`