Answer :
Each box had 100 blocks in it.
-- 1/5 of the blocks in one box = 100/5 = 20 blocks.
-- 1/5 of the blocks in the other box = 100/5 = 20 blocks.
-- Total number of blocks used = (20 + 20) = 40 blocks.
-- 1/5 of the blocks in one box = 100/5 = 20 blocks.
-- 1/5 of the blocks in the other box = 100/5 = 20 blocks.
-- Total number of blocks used = (20 + 20) = 40 blocks.