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Answer

tins of milk powder bought : number of freebies
5 : 8

8 – 5 = 3 (parents bought tins of milk powder with pacifiers)
5 – 3 = 2

Ans : 2 parents.

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Assumption.

If all 5 tins chose washcloth as freebie, number of freebies -> 5 x 1 = 5

Actual difference -> 8 – 5 = 3

Freebie difference ->  2 – 1 = 1

3 / 1 = 3

Therefore, 2 chose washcloth, 3 chose pacifiers

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