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Pre-Algebra Questions? Define variables, write equations, and solve!

+4 votes
2. Twice the sum of 9 and a number is 84. Find the number.
asked Feb 11, 2013 in PRE-ALGEBRA by abstain12 Apprentice
reshown Feb 11, 2013 by bradely

1 Answer

+2 votes

Let the number is x.

Twice the sum of 9 and a number is 84.

i.e. 2(x + 9) = 84.

Divide each side by 2.

[2(x + 9)]/2 = 84/2

x + 9 = 42

Subtract 9 from each side.

x + 9 - 9 = 42 - 9

x = 33.

Therefore the number is x = 33.

answered Feb 11, 2013 by richardson Scholar

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