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29 December, 06:13

Mark bought a notebook for $1.45 and some pencils for $0.42 each. If the total cost was $6.91, how many pencils did he buy?

A. 12

B. 13

C. 14

D. 15

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Answers (2)
  1. 29 December, 06:18
    0
    B - 13

    Okay, we know that Mark brought 1 notebook and the totally is 6.91 while one pencil costs $0.42.

    x = number of pencils he brought.

    we know the price of 1 notebook + the cost of pencils times the numbers of pencils he brought = total cost.

    So the equation will be:

    1.45 + 0.42x = 6.91 subtract 1.45 on both sides.

    0.42x = 5.46 Then we solve for x by dividing both sides by 0.42

    x = 13

    So the number of pencils he brought is 13.
  2. 29 December, 06:27
    0
    1. 6.91 - 1.45 = 5.46

    You subtract the notebook from the total cost

    2. 5.46 / 0.42 = 13

    You divide the cost of a pencil from the left over amount of money to see how many pencils Mark bought

    3. Mark bought 13 pencils
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