Question

Janet is 3 yrs older than her sister julie. Janet brother is eight yrs younger than their sister julie. The sum of all their ages is 55 yrs

Answer 1

Janet: x + 3

Julie: x

brother: x - 8

Janet + Julie + brother = sum

x + 3 + x + x - 8 = 55

3x - 5 = 55

+5 +5

3x = 60

`(3x)/(3) = (60)/(3)`

x = 20

Janet: x + 3 ⇒ (20) + 3 = 23

brother: x - 8 ⇒ (20) - 8 = 12

Answer: Janet=23, Julie=20, brother=12