Answer:
2/5
Explanation:
Their ages are in the ratio,
Tareq:Hassan
= 10:15
= 2:3
So for every TWO marbles that Tareq gets, Hassan gets THREE marbles.
That's a total of FIVE marbles split between them. Every handful of 5, Tareq gets 2 (and Hassan gets 3)
Tareq gets 2 out of 5 marbles.
Tareq gets 2/5 of the marbles.