Question

A boy weighs 88 pounds. How much does he weigh in kilograms? Use the following conversion: 1 kilogram is 2.2 pounds

Answer 1

He weighs 40 kg

Explanation:

If 1 kg = 2.2 pounds, set up a proportional relationship

`(2.2 lbs)/(1 kg)` =
`(88 lbs)/(x kg)`

2.2x = 88

x = 40

Answer 2

Answer: 40 kg

Work Shown:

`88 \ \text{ lbs} \approx 88 \ \text{ lbs} * \frac{1 \ \text{ kg}}{2.2 \ \text{ lbs}}\\\\ 88 \ \text{ lbs} \approx (88*1)/(2.2)\ \text{ kg}\\\\ 88 \ \text{ lbs} \approx 40 \ \text{ kg}\\\\`

The more accurate value is that 88 lbs = 39.9161286 kg, where 1 kg = 2.20462262 lbs approximately.

Take notice how I placed the units in the 1st step so that the "lbs" terms would cancel.

Lbs = pounds