A pendulum swings 20 times in 30 seconds. How many swings in 2 minutes?
Answer
80 swings
How to solve it
1
Swings in 30 sec: 20
2
2 minutes = 120 seconds
3
120 ÷ 30 = 4 periods
4
Swings: 20 × 4 = 80
Hints
Convert 2 minutes to seconds
How many 30-second periods?
Multiply swings by periods