Xiaogua and his brother went fishing and caught 23 fish in all. My brother caught three times as many fish as his brother, so how many did he catch?

Solution: Suppose my brother catches X fish and my brother catches 3x+3 fish.

3x+3+x=23

4x+3=23

4x=23-3

4x=20

x = 20 \4

x=5

Brother fishing number =23-x=23-5= 18.

A: My brother caught 18 fish.