Keith has 2/5 as many stickers as Janet. They have a total of 280 stickers. How many stickers must Janet give to Keith so that they will have the same number of stickers?
k = 2/5 j
k+j = 280
so,
2/5 j + j = 280
7/5 j = 280
j = 5/7 * 280 = 200
so Janet needs to give Keith 60 stickers so they each have 140