document.write( "Question 126700: Twice the sum of a number and 8 is 40. Find the number \n" ); document.write( "

Algebra.Com's Answer #92833 by bucky(2189) $\"\"$ $\"About$

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If X is the unknown number, then the sum of that number and 8 is represented as X + 8. And twice
\n" ); document.write( "the sum of the number and 8 is 2(x + 8). The problem tells you that this must equal 40.
\n" ); document.write( "In equation form this is:
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\n" ); document.write( "2(X + 8) = 40
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\n" ); document.write( "Multiply out the left side by multiplying 2 times each of the terms in parentheses to get:
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\n" ); document.write( "2X + 16 = 40
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\n" ); document.write( "Get rid of the 16 on the left side by subtracting 16 from both sides to get:
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\n" ); document.write( "2X = 24
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\n" ); document.write( "Solve for X by dividing both sides of this equation by 2 and you have that X, the unknown
\n" ); document.write( "number, is:
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\n" ); document.write( "X = 24/2 = 12
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\n" ); document.write( "Check: Does twice the sum of 12 and 8 = 40??? 12 + 8 equals 20 and twice 20 is, in fact,
\n" ); document.write( "40. So the answer checks. X = 12 is the answer.
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\n" ); document.write( "Hope this helps you to understand the problem.
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