Question

Red and Grey bricks were used to build a decorative wall. The number of red bricks/the number of grey bricks was 5/2. There were 224 bricks used in all. How many red bricks were used?

Answer 1

let's suppose r = # of red bricks and g = # of grey bricks

if the ratio of red/grey = 5/2, then r/g = 5/2

solving this equation for g --> g = (2/5)r

since there are 224 bricks total, r + g = 224
substituting g = (2/5)r into the equation ----> r + (2/5)r = 224, solve for r