Nick and Cole have some grey notebooks and some silver notebooks. The number of silver notebooks Nick has is equal to the number of grey notebooks Cole has. ¹₅ of Nick's notebooks are grey and ⁵₆ of Cole's notebooks are silver. There are a total of 60 grey notebooks. Find the total number of notebooks they have.

Nick		Cole		Total
Grey	Silver	Grey	Silver
	1x4	1x4
1x1	4x1	1x4	5x4
1 u	4 u	4 u	20 u	29 u

The number of Nick's silver notebooks and Cole's grey notebooks is the same.

The number of Nick's silver notebooks is repeated. The number of Cole's grey notebooks is repeated.  Make the number of Nick's silver notebooks and Cole's grey notebooks the same.  LCM of 4 and 5 is 4.

Number of grey notebooks
= 1 u + 4 u
= 5 u

5 u = 60

1 u = 60 ÷ 5 = 12

Total number of notebooks
= 1 u + 4 u + 4 u + 20 u
= 29 u
= 29 x 12
= 348

Answer(s): 348