Step-by-step explanation:
you should solve it as a system.
Let's say the child ticket is a, and the senior ticket is b.
3b + a = 38
3b + 2a = 56
The fact that the second day they sold just ONE more child ticket and the price increased for 18$, it shows us that the child ticket is 18$. Now we know a, let's find b :
3b + 18 =38
3b = 20
b= 20/3
The price od the senior ticket doesn't really make sense, but you should seek some other answers too.
English is not my first language so maybe i did not understand it very well.
