Question

The number of fish in a lake decreased by 25% between last year and this year. Last year there were 60 fish in the lake. What is the population this year? (Consider using a tape diagram)

Answer 1

Answer: This population, the population is 45 fish.

Step-by-step explanation: This problem can be solved by a rule of three. Last year there were 60 fish in the lake. That was 100, that is, decimal 1. This year it decreased by 25%. So there 100%-25% = 75%, that is decimal 0.75. So 60 fish - 1 x fish - 0.75. This population, the population is 45 fish.

Answer 2

45 fish this year
60(0.25)=45