Question

red and grey bricks were used to build a decorative wall. the number of redbricks over the number of grey bricks was 5/2. there were 175 bricks used in all. how many red bricks were used?

Answer 1

The ratio of 5/2 indicates that for every 5 Red bricks 2 Gray bricks are used which means 5 red bricks out of 7 total bricks.  Set it as a proportion (5/7) x 175 = 125  Hope this helps.