A total of 15 tricycles and bicycles are to be manufactured. If the total number of wheels available is 40, how many tricycles and bicycles can be manufactured respectively?

A5, 10

B8, 7

C7, 8

D10, 5 ✓ Correct

Correct answer: (D) 10, 5

Explanation

10 tricycles and 5 bicycles can be made.

Let tricycles = t, bicycles = b, with t + b = 15.

Wheels: 3t + 2b = 40.

Substitute b = 15 - t: 3t + 2(15 - t) = 40, so t + 30 = 40.

t = 10, b = 5.

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