Question 7

A bakery opened with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 60% of the remaining rolls were sold between noon and closing time. How many dozen rolls were left unsold?

Solution

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They started with 40 dozen rolls. Half of them (=20 dozen) were sold by noon.

40% of the remaining rolls (half of 40 dozen) were left unsold, which is 0.4 x 20 = 8 dozen rolls

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