Question

A man needs to prepare 15 plates of french fries for his friends. He takes 11 minutes to prepare 1 plate. how much time will he take to prepare all the plates?

Answer 1

Time taken for preparing 1 plate
= 11 minutes

Time taken for preparing 15 plates = 15 times 11
= 15 $\times$ 11
= (10 + 5) $\times$ 11
= 10$\times$ 11 + 5 $\times$ 11
= 110 + 55
= 165 minutes