what is the answer?

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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