Answer:
0.67.
Explanation:
While the trip for children is 37% cheaper than the trip for an adult, it can be said that the value of the trip for children is 63% of the value for adults (100-37 = 63).
Thus, to determine the value of the tickets for children, the value of the tickets for adults must be multiplied by 0.67, that is, proposing the following equation: A x 0.67 = C.