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28 December, 15:28

I am x years old and my brother is 7years. If you take 80% of the sum of our ages the result will be 12. Write an equation and solve it to find my age

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Answers (2)
  1. 28 December, 15:53
    0
    Answer: you are 8 years old.

    Step-by-step explanation:

    You are x years old and your brother is 7years old. The sum of your ages is

    (x + 7) years

    If you take 80% of the sum of our ages the result will be 12. 80% of the sum of your ages is

    80/100 * (x + 7) = 0.8 (x + 7)

    Therefore, the equation would be

    0.8 (x + 7) = 12

    0.8x + 5.6 = 12

    0.8x = 12 - 5.6

    0.8x = 6.4

    x = 6.4/0.8

    x = 8 years
  2. 28 December, 15:55
    0
    8years

    Step-by-step explanation:

    I am x years old and

    my brother is 7years.

    The sum of our ages is (x+7)

    If you take 80% of the sum of our ages the result will be 12.

    80% (x+7) = 12

    (80/100) (x+7) = 12

    (4/5) (x+7) = 12

    These is the equation (4/5) (x+7) = 12

    Divide both sides by 4/5

    (x+7) = 12 / (4/5) = 12 * (5/4) = 3 * 5 = 15

    x+7 = 15

    x = 15-7 = 8

    My age is x = 8 years

    And my brother is x+7 = 8+7 = 15years
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