How many children took exactly one ride?
Explanation:
Let x, y and z be the number of children who took 1 rides, 2 rides and 3 rides respectively. Since z = 20 and y + z = 55, y = 35. Then, total number of rides = x + 2y + 3z = 145 ⇒ x + 2 × 35 + 3 × 20 = 145 ⇒ x = 15
Number of children, who took exactly one ride = x = 15
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