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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?

 Nov 5, 2021
 #1
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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

 Jun 9, 2022

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