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 By: achieve_goal (offline)  Wednesday, September 28 2011 @ 06:05 AM CDT (Read 953 times)
achieve_goal

He donated 11/12 of them to SPCA.

1/4 of the donated stamps were

unused stamps and the rest

were used stamps. How many

used stamps did Andy donate

to SPCA?

Regular Member

Registered: 09/14/11
Posts: 102

 By: GIM (offline)  Wednesday, September 28 2011 @ 10:08 PM CDT
GIM

12 units ------240 stamps
1 unit ------ 240 / 12 = 20 stamps OR Total Donated stamps = 11/12 x 240 = 220
11 units ------ 11 x 20 = 220 stamps
Total Donated stamps = 220

1/4 unused stamps
1 - 1/4 = 3/4 used stamps
4 units ------ 220 stamps
1 unit ------- 220/4 = 55 stamps OR Donated Used stamp = 3/4 x 220 = 165
3 units ------ 3 x 55 = 165 stamps
used stamps = 165

Regular Member

Registered: 11/07/10
Posts: 70

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