Question

Ahmad is x years old
His sister is 4 years older than him
How old is his sister?
His sister is
years old

Answer 1

Step-by-step explanation:

if Ahmed is x years old

so her sister will be x+4 years old

Answer 2

Step-by-step explanation:

Let the present Age of sister = x years

Let the present Age of brother = y years

As per 1st condition

x = y +4

x - y = 4 ………………..(1)

As per 2nd condition

(x - 2 ) + (y - 2 ) = 20

x + y - 4 = 20

x + y = 24 ……………….(2)

Adding (1) and (2), we get

x - y + x + y = 4+24

2x = 24

x = 12

Substitute the value of x in (1), we get

12-y = 4

y = 8

Therefore, present Age of brother = 8 years