A total of 9 green rulers and yellow rulers are in a container. The ratio of green rulers to yellow rulers was 1 : 2. Some pink rulers and grey rulers were put into the container. For every 1 yellow rulers that were already in the container, 14 grey ones were added. Then, the final number of green rulers and pink rulers was ⁵₆ the final number of yellow rulers and grey rulers. Find the total number of pink and grey rulers.

Pink rulers	Green rulers	Yellow rulers	Grey rulers
	1x1	2x1
		1x2	14x2
5x5		6x5
24 u	1 u	2 u	28 u

The number of yellow rulers is repeated.  Make the number of yellow rulers the same.  LCM of 2 and 1 is 2.

The total number of yellow rulers and grey rulers is repeated.  Make the total number of yellow and grey rulers the same.  LCM of 30 and 6 is 30.

Total number of green rulers and yellow rulers
= 1 u + 2 u
= 3 u

3 u = 9

1 u = 9 ÷ 3 = 3

Total number of pink and grey rulers
= 24 u + 28 u
= 52 u
= 52 x 3
= 156

Answer(s): 156