A teacher had 12 purple pens if the ratio of purple pens to blue pens she owned was 4:1 how many pens did she have total?

Question

A teacher had 12 purple pens if the ratio of purple pens to blue pens she owned was 4:1 how many pens did she have total?

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Aaliyah 3 weeks 2022-01-03T01:35:21+00:00 2 Answers 0 views 0

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    0
    2022-01-03T01:36:21+00:00

    Answer:

    15

    Step-by-step explanation:

    Using cross multiplication, this is what I came up with:

    \frac{4}{1} x \frac{12}{x}

    Or, 4x=12.

    To make x be on it’s own, we will divide 12 by 4, therefore removing the 4 from the right side of the equation. Since x = 3, we add that number to the total of purple pens, giving us a total of 15.

    0
    2022-01-03T01:36:47+00:00

    12 purple pens = 4 parts
    1 part = 12/4 = 3
    4 parts purple + 1 part blue = 5 parts
    3 x 5 = 15

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