ANSWER
Step-by-step explanation
Let the price of one senior ticket be s.
Let the price of one child ticket be c.
Three senior tickets and one child ticket sold for $40. This implies that:
Three senior tickets and two child tickets sold for $52. This implies that:
From the first equation, make 3s the subject of the formula:
Substitute this into the second equation:
Solve the equation for c by collecting like terms:
Therefore, a child ticket goes for $12.