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6 August, 18:08

troy and his sister caitlin can earn money by choosing to do chores around the house. last month caitlin earned $5 more than twice what troy earned. if the sum of their earnings was $80 how much did caitlin earn that month

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  1. 6 August, 18:25
    0
    Lets solve this algebraically

    25 is what troy has.

    Caitlin has $55

    Step-by-step explanation:

    x+2x+5=80 3x=75 x=25
  2. 6 August, 19:45
    0
    Caitlin equals 55

    Step-by-step explanation:

    t = the money troy earned

    c = money caitlin earned

    The sum of their earnings was 80

    t+c = 80

    last month caitlin earned $5 more than twice what troy earned

    c = 2t+5

    We have 2 equations and 2 unknowns

    Substitute the second equation into the first

    t+c = 80

    t+2t+5 = 80

    Combine like terms

    3t+5 = 80

    Subtract 5 from each side

    3t+5-5 = 80-5

    3t = 75

    Divide by 3

    3t/3 = 75/3

    t = 25

    Now we need to calculate c

    c = 2 (25) + 5

    c = 50 + 5

    c = 55
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