Question 1161483
<br>
Let Jim's age be x.<br>
Then his father's age is x+31 (Jim is 31 years younger than his father).<br>
And his grandfather's age is x+70 (His grandfather is 70 years older than he is).<br>
The sum of their ages is 137:<br>
{{{(x)+(x+31)+(x+70) = 137}}}<br>
Solve using basic algebra....<br>