UKMT - Senior Mathematical Challenge - 2022 - 7 | Exact Science

7

In 2021, a first-class postage stamp cost 85p and a second-class postage stamp cost 66p. To spend an exact number of pounds and buy at least one of each type, what is the smallest total number of stamps that should be purchased?

A. 10 B. 8 C. 7 D. 5 E. 2

Answer

C

SOLUTIOn

The smallest total number of stamps to achieve a total sum ending in 0 is 7.

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