Primary Mathematics Challenge - 2022 - 9 | Exact Science

9

My maths teacher Addum Kwickly has 18 socks (9 pairs of socks).He puts on clean socks every three days.How many days can he wear these socks before he has to wash them all?

A. 12

B. 18

C. 21

D. 27

E. 36

Answer

D. 27

SOLUTIOn

The teacher has 9 pairs of socks, and he wears each for three days. So he will need to wash them all after 9 × 3 = 27 days.

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