Question. Dan owns an ice cream shop and every sixth customer gets a free ice cream cone. Cones cost $2 each. If he sold $100 worth of cones, how many free ones did he give away?
Answer. 10
What step-by-step reasoning justifies that answer?
Reasoning: He sold 50 cones because 100 / 2 = 50. He gave away 10 cones because 50 / 5 = 10.