Answer and Step-by-step explanation:
To solve, we would set the first number to x, and make an equation.
Solve for x.
x + (x - 6) + 3x = 69.
Add and combine like terms.
2x + 3x - 6 = 69
5x - 6 = 69
Add 6 to each side of the equation.
5x = 75
Divide by 5 to both sides.
x = 15
The first number is 15.
The second number is (x - 6) = (15 - 6) = 9.
The third number is 3x = 3(15) = 45.
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