Howard and Perry have some white markers and some black markers. The number of black markers Howard has is equal to the number of white markers Perry has. ²₃ of Howard's markers are white and ¹₃ of Perry's markers are black. There are a total of 60 white markers. Find the total number of markers they have.

Howard		Perry		Total
White	Black	White	Black
	1x2	1x2
2x2	1x2	2x1	1x1
4 u	2 u	2 u	1 u	9 u

The number of Howard's black markers and Perry's white markers is the same.

The number of Howard's black markers is repeated. The number of Perry's white markers is repeated.  Make the number of Howard's black markers and Perry's white markers the same.  LCM of 1 and 3 is 2.

Number of white markers
= 4 u + 2 u
= 6 u

6 u = 60

1 u = 60 ÷ 6 = 10

Total number of markers
= 4 u + 2 u + 2 u + 1 u
= 9 u
= 9 x 10
= 90

Answer(s): 90