What are the steps to this problem?

D. 1.3333

Step-by-step explanation:

Adults cost $13 and children cost $12.

To solve this, we will write and solve a pair of linear equation. A will represent the cost of an adult ticket and c will represent the cost of a children's ticket.

We have:

3a + 4c = 87
2a + 3c = 62

We can multiply the top equation by 2 and the bottom equation by -3.

We will have:

6a + 8c = 174
-6a + -9c = 186

Adding them gives us:
-1c = -12
or just c = 12

Substitute in 12 for c and we will find that a = 13
3a + 48  = 87
3a = 39
a = 13