Faris has a box of 150 building blocks.
a) He uses some of the blocks to make a tower.
70 blocks are left over.
How many blocks has he used?
80 blocks
b) He uses the 70 blocks left over to make another two towers.
One tower takes 35 blocks and the other takes 20 blocks.
4
How many of the 70 blocks has he got left?
blocks