11

To save money, Scrooge is reusing tea bags. After a first ‘decent’ cup of tea, he dries the bag and uses two such dried bags to make a new ‘decent’ cup of tea. These bags are then dried again and four such bags now make a ‘decent’ cup of tea. After that they are put on the compost heap.How many ‘decent’ cups of tea can Scrooge get out of a new box of 120 tea bags?

A. 480

B. 240

C. 210

D. 195

E. 180

Answer

C. 210

SOLUTIOn

As 120 is a multiple of 4, Scrooge is able to use all of the tea bags when he uses two dried teabags per cup and when he uses four dried tea bags per cup. Hence the required number of ‘decent’ cups of tea is 120+120÷2+120÷4 = 120+60+30 = 210.

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