Two times the sum of a number and five is 20

Answer 1

Two times the sum of a number and 5 is 20...

Let x be a number,

then "the sum of a number and 5" in mathematical terms is: (x + 5)

and "two times the sum of a number and 5" in mathematical terms is: 2(x+5)

We know that "two times the sum of a number and 5 is 20" is therefore: 2(x + 5) = 20

Work step by step to solve this equation:

2(x + 5) = 20 divide both sides by 2

2(x + 5) = 20

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2 2

x + 5 = 10 move and group like things by adding and subtracting, as needed, from both sides

-5 -5

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x + 0 = 5 simplify

x = 5