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bellanna
Lucy has 30 minutes to decorate 12 cupcakes. she can spend 2 minutes and 30 seconds on each cupcake. this is because 30/12= 2.5 which is equal to two minutes and thirty seconds. she spend two minutes and thirty seconds decorating each cupcake.
Billymkhoi
(1/2 hour/ 12 cupcakes)* (60 minutes/ 1 hour)= 2.5 minutes/ cupcake.
(Note that the unit cancels out so you get the answer)

Lucy can spend 2.5 minutes on each cupcake~

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