4.167 I think but I'm not completely sure
Answer:
36
Step-by-step explanation:
72÷2
2 adults per one child
We know that ∠1 equals ∠3, from that we can find x:

The sum of ∠1 and ∠2 must equal 180°:

Since we already know x, we can solve for y:

Result: x=10, y=6