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15 October, 21:21

To make 3 dozen cookies, a recipe calls for 4 eggs and 1/2 cup of chocolate chips. Ben wants to make 12 dozen cookies for a class picnic. How many eggs and how many cups of chocolate chips does he need?

A. 4 eggs, 1 cup chocolate chips

B. 4 eggs, 2 cups chocolate chips

C. 16 eggs, 1 cup chocolate chips

D. 16 eggs, 2 cups chocolate chips

Bill picked 1/2 of the apples on his grandmother's tree. After Bill finished, Sally picked 1/3 of the apples that were left on the tree. After Sally finished, there were

40 apples left on the tree. How many apples were on the tree before they picked apples?

A. 40

B. 60

C. 80

D. 120

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Answers (1)
  1. 15 October, 22:33
    0
    First problem

    The recipe is written for 3 dozen cookies.

    Hew wants to make 12 dozen cookies.

    12 dozen is 4 times 3 dozen, so multiply each amount by 4 to make 12 dozen cookies.

    4 eggs * 4 = 16 eggs

    1/2 cup chocolate chips * 4 = 2 cups chocolate chips

    Second problem

    Let's start from the end.

    There were 40 apples left on the tree.

    Sally picked 1/3 of the apples that were left for her.

    40 apples were left after Sally finished.

    Since Sally picked 1/3 of the apples, she left 2/3 of the apples on the tree.

    2/3 of the apples were 40 apples. 1/3 is 20 apples, so the number of apples left for Sally is 60 apples. Before Sally started, there were 60 apples.

    Bill had picked 1/2 the apples, which means he left half of them. He left 60. That means to original number was 120 apples.

    Answer: 120 apples.
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