document.write( "Question 664: One number is more than 3 times another. Their sum is 21. What is their product? \n" ); document.write( "
Algebra.Com's Answer #225 by janinecb(25)\"\" \"About 
You can put this solution on YOUR website!
I think there is a number missing from this problem. I am going to guess which number is missing and then solve that problem for you. Hopefully this will help to solve the actual original problem.
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\n" ); document.write( "The revised problem:
\n" ); document.write( "One number is 5 more than three times another. Their sum is 21. What is their product?
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\n" ); document.write( "Turn the two first sentences into euqations. Here is the first one:
\n" ); document.write( "One number is 5 more than three times another.
\n" ); document.write( "x = y + 5
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\n" ); document.write( "Notice that the word is turns into the equals sign and the more than turns into addition.
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\n" ); document.write( "The second sentences is here:
\n" ); document.write( "Their sum is 21.
\n" ); document.write( "x + y = 21
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\n" ); document.write( "Notice that the word sum signals addition and again the word is turns into the equals sign.
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\n" ); document.write( "Once the two equations are set, use substitution to find one of the numbers.
\n" ); document.write( "(y + 5) + y = 21 (Note: y + 6 is being used instead of x in the second equation.)
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\n" ); document.write( "This simplifies to:
\n" ); document.write( "2y + 5 = 21
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\n" ); document.write( "The next step is to subtract 5 from both sides. This leaves you with:
\n" ); document.write( "2y = 16
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\n" ); document.write( "Next divide both sides by 2. This leaves you with:
\n" ); document.write( "y = 8
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\n" ); document.write( "Now that we found y, we can substitute 8 in for one of the y's in the first two equations to find out what x is.
\n" ); document.write( "x = y + 5 turns into x = 8 + 5
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\n" ); document.write( "So, x = 13.
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\n" ); document.write( "Now that we know that x = 13 and y = 8, we can answer the final question of what is the product of these two numbers.
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\n" ); document.write( "Product means the answer to a multiplication problem, so we multiply 13 and 8 to get the final answer of 104.
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\n" ); document.write( "Remember, this is with the assumption that the missing number in the problem is 5. \n" ); document.write( "
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