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The perimeter of a playing card is 30 centimeters. The playing card is 5 centimeters wide. How tall is it?
(I think) it's 10 cms because total perimeter is 30 centimeters so there will be 5 on two sides making 10,30-10=20 and 20/2=10 which makes a total of 30 (5+5+10+10)
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