Question

Red and grey bricks were used to build a decorative wall. The number of red bricks and grey bricks was 5/2. There were 140 bricks used in all. How many red bricks were used?

Group of answer choices

40

100

20

28

Answer 1

100 red bricks

Explanation:

Let's say red bricks is equal to 5x

Gray bricks is equal to 2x

We have an equation

2x + 5x = 140

= 7x = 140

Divide through by 7 to get the value of x

X = 140/7

X = 20

Red bricks = 5(x)

= 5(20)

= 100

Gray bricks = 2(x)

= 2(20)

= 40

Therefore in conclusion the number of red bricks is 100.