Question

The mass of a patient decreased by 20 percent every month. If his mass before the decrease was 90kg, how many kilograms had he lost after 3 months ?

Answer 1

Answer: 46.08 kg

Answer:

`90 / 100 * 20 = 18`

`90 - 18 = 72`

`72 / 100 * 20 = 14.4`

`72 - 14.4 = 57.6`

`57.6 / 100 * 20 = 11.52`

`57.6 - 11.52 = 46.08`

Explanation:

Theres probably a better solution but brute force is sometimes good enough