2024 AMC 8 Problems/Problem 12
Problem
Rohan keeps a total of 90 guppies in 4 fish tanks.
There is 1 more guppy in the 2nd tank than in the 1st tank. There are 2 more guppies in the 3rd tank than in the 2nd tank. There are 3 more guppies in the 4th tank than in the 3rd tank.
How many guppies are in the 4th tank?