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16-05-2018
Mathematics

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The sum of 3 number is 80. the third number is 3 times the first. the first number is 5 less the second. what are the numbers

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19-05-2018

1st number = x-5
2nd number = x
3rd number = 3x-15
Total = 80
x-5+x+3x-15=80
5x-20=80
5x=100
x=20
The numbers are 20, 15, 45

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