# Holly's grandfather is 52 years older than her. In 7 years, the sum of their ages will be 70. What is Holly's present age?

Dec 6, 2017

$4$ years old.

#### Explanation:

$H$ is Holly’s age, $G$ is her grandfather's.

$H + 52 = G$

$H + 7 + G + 7 = 70$

So

$H - G = - 52$

$H + G = 56$

Therefore,

$H = 4$