Tim made 4 stacks of wooden blocks. The first stack was 4 blocks tall. The second stack was 6 blocks taller than the first. The third stack was 7 blocks shorter than the second stack, and the last stack was 5 blocks taller than the third stack. How many blocks did Tim use in all?
tim used 25 blocks. 4 blocks for the first stack 10 blocks for the second [6 blcoks taller] 3 blocks for the third [7 blocks shorter] 8 blocks for the fourth [5 blocks taller] 4+10+3+8 = 25
