Question

The sum of three numbers in order is 57. The equation that represents this is x + (x + 1) + (x + 2) = 57. Which value of x from the set {16, 17, 18, 19} makes the equation true?

Answer 1

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Answer 2

to figure out which x value makes the equation true, simply solve for x

x + (x + 1) + (x + 2) = 57

the signs are all plus signs which makes distributing easy. you can simply remove the parentheses to get

x + x + 1 + x + 2 = 57

three x's together combine to get 3x
1 + 2 make 3

so simplifying, we now have 3x + 3 = 57

subtract 3 from both sides, then divide both sides by 3