In a book shop, the number of highlighters was ⁷₉ of the total number of highlighters and post-it pads together. Cole sold the highlighters and post-it pads in sets of 4 highlighters and 7 post-it pads. After selling all the post-it pads, he still had 287 highlighters left. How many post-it pads were in the book shop were sold?

	Highlighters	Post-it Pads
Before	7x7 = 49 u	2x7 = 14 u
Change	- 4x2 =  - 8 u	- 7x2 = - 14 u
After	287	0

Since all the post-it pads were sold, the number of post-it pads at first and the number of post-it pads sold were the same.  Make the number of post-it pads at first and sold the same.  LCM of 2 and 7 is 14.

Number of highlighters sold
= 49 u - 8 u
= 41 u

41 u = 287

1 u = 287 ÷ 41 = 7

Number of post-it pads were sold
= 14 u
= 14 x 7
= 98

Answer(s): 98