what is the answer?

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...

You need to assign numbers that you have left out,

Let's say SUM of the numbers are 50

The 3rd number is 2 times the 2nd.

3rd number 40 less than the 2nd.

Let's assign ( X , Y , z ) to 3 numbers in order. Now we convert English statements, to their algebraic

counterpart.

X + Y + Z = 50

Z = 2Y

Z = Y -40

Now we have 3 equations and 3 unknowns to solve.

We observe that 2nd and 3rd equations both are equal to Z

2Y = Y - 40

Y = -40

Z = -80 / substitution in 2nd equation

X - 40 - 80 = 50

X = 50 + 120 = 170.

See, this is not the way to learn, where you don't even give enough information to have an answer.

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