Answer :

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If 5 biscuits cost 40p

1 biscuit would cost (40p divided by 5) 8p

8p multiplied by 3 (to get 3 biscuits) would cost 24p

3 biscuits cost 24p
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We can divide 40 by 5 to get the cost of 1 biscuit, and we can multiply that to 3 to get our final answer. 40 / 5 = 8, and 8 x 3 = 24, so 3 biscuits cost 24p.