: A school-age child's height has changed from 135 cm to 140 cm. How many inches of height should the nurse tell the child that he has grown?
1. 0.02
2. 0.2
3. 2
4. 4
3
Rationale 1: Previous height in inches = 1 inch/2.5 cm x 135 cm/1. Multiply the numerators (1 x 135 = 135). Multiply the denominators (2.5 x 1 = 2.5). 135/2.5 = 54 inches. Current height in inches = 1 inch/2.5 cm x 140 cm/1. Multiply the numerators (1 x 140 = 140). Multiply the denominators (2.5 x 1 =1). 140/2.5 = 56. 56 - 54 = 2 inches. The child has grown 2 inches since the last measurement.
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