Question

A scientist wants to study 24 stars. He studies 1/3 of them one week and ¼ of the remainder the next week. How many are left to study?

Answer 1

12

Explanation:

`(1)/(3)` × 24 = 24 ÷ 3 = 8 ← stars studied from one week

24 - 8 = 16 left to study

`(1)/(4)` × 16 = 4 ← number studied in second week

number studied over the 2 weeks = 8 + 4 = 12

number left to study = 24 - 12 = 12