8. Peter the penguin likes catching fish. On Monday, he realised that if he had caught three times as many fish as he actually did, he would have had 24 more fish. How many fish did Peter catch?
A 12
B 10
C 9
D 8
E 6
Solution
A

Let the number of fish Peter caught be $n$. The information in the question tells us that $3 n=n+24$, which has solution $n=12$. Therefore Peter caught 12 fish.