Mark bought some erasers and gave half of them to Susan.
Susan bought some stickers and gave half of them to Mark.
Mark sold 6 stickers and Susan sold 10 erasers.
The number of stickers Mark had in the end became 1/5 of the
number of erasers that he had in the end.
The number of stickers that Susan had in the end became 1/3 of
the number of erasers that she had in the end.
How many stickers did Susan buy?
+237 Let x be no. of erasers
y be no. of stickers
Mark
1/2x
1/2y - 6
1/2y - 6 = 1/5(1/2x)
(y - 12)/2 = x/10
5y - 60 = x
5y - 60 = (3y + 20)
y = 40, x = 140
Susan
1/2x - 10
1/2y
1/2y = 1/3(1/2x - 10)
3y = x - 20
3y + 20 = x
Susan bought 40 stickers
