42.9k views
18 votes
The number of fish in a lake decreased by 25% between last year and this year. This year there are 45 fish in the lake. What was the population of last year

User Beanie
by
6.7k points

1 Answer

5 votes

Answer:

The population of last year was 60.

Explanation:

From the information given, as you know that the number of fish in a lake decreased by 25% between last year and this year, the amount of fish this year represents 75% of last year's population as: 100%-25%=75%. With that, you can use a rule of three to find last year's population tha would represent 100% given that 75% is equal to 45 fish.

75% → 45

100% → x

x=(100*45)/75= 60

According to this, the answer is that the population of last year was 60.

User Soth
by
6.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.