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20 January, 02:03

The sum of three numbers is 18. The sum of the first and second numbers is 15, and the first number is 3 times the third number. Find the numbers.

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Answers (2)
  1. 20 January, 02:14
    0
    9, 6, and 3 are the numbers.

    -TTL
  2. 20 January, 02:19
    0
    3, 6, 9

    Step-by-step explanation:

    suppose these three numbers are a, b, and c. we can write the following equations:

    #1 a+b+c = 18

    #2 a+b = 15

    #3 a = 3c

    if we subtract #2 from #1 we have c = 3. From #3 we have a = 3 (3) = 9. Finally, since a+b+c = 18 we plug in our known values for a and c to obtain b = 6. therefore our three numbers are a = 9, b = 6, c = 3.
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