Question

Maria is 7 years older than her brother Robert and in 2 years her age will be four times what Robert’s age was three years ago. Find their present ages.

Answer 1

MARIA=14

ROBERT=7

Explanation:

Now

MARIA=X+7

ROBERT=X

In 2 years

MARIA=X+7+2=X+9

ROBERT=X+2

3 years ago

MARIA=X+7-3=X+4

ROBERT=X-3

EQUATION

X+9=4(X-3)

X+9=4x-12

X-X+9=4x-x-12

9=3x-12

3x=21

X=7

ROBERT=7

MARIA=7+7=14

Answer 2

Robert is 7 years old and Maria is 14.