document.write( "Question 318765: 1. Sam is 10 years older than Jack. Twice Sam's age subtracted from 6 times Jack's age is 7 more than Jack's age. Find Jack and Sam's age.\r
\n" ); document.write( "\n" ); document.write( "2. Separate 65 into two parts such that 3 times the larger will be 6 more than 6 times the smaller. (HINT: let x and 65-x represent your two numbers)\r
\n" ); document.write( "\n" ); document.write( "3. Gill has $3.75 is quarters, dimes, and nickels. He has twice as many quarters as dimes and three more dimes than nickels. Find how much of each coin Bill has.
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Algebra.Com's Answer #228184 by stanbon(75887)\"\" \"About 
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1. Sam is 10 years older than Jack. Twice Sam's age subtracted from 6 times Jack's age is 7 more than Jack's age. Find Jack and Sam's age.
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\n" ); document.write( "Equations:
\n" ); document.write( "s = j+10
\n" ); document.write( "6j-2s = j+7
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\n" ); document.write( "Substitute for \"s\" and solve for \"j\".
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\n" ); document.write( "2. Separate 65 into two parts such that 3 times the larger will be 6 more than 6 times the smaller. (HINT: let x and 65-x represent your two numbers)
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\n" ); document.write( "Equation:
\n" ); document.write( "You don't know which is larger so use either as the largest.
\n" ); document.write( "3x =6(65-x)+6
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\n" ); document.write( "3. Gill has $3.75 is quarters, dimes, and nickels. He has twice as many quarters as dimes and three more dimes than nickels. Find how much of each coin Bill has.
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\n" ); document.write( "Equations:
\n" ); document.write( "q = 2d
\n" ); document.write( "d = n+3
\n" ); document.write( "5n + 10d + 25q = 375 cents
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\n" ); document.write( "Substitute for \"d\" and for \"n\" and solve for \"q\":
\n" ); document.write( "d = q/2
\n" ); document.write( "n = d-3 = (q/2)-3
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\n" ); document.write( "5[(q/2)-3] + 10(q/2) + 25q = 375
\n" ); document.write( "(5/2)q - 15 + 5q + 25q = 375
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\n" ); document.write( "Multiply thru by 2 to get:
\n" ); document.write( "5q - 30 + 60q = 750
\n" ); document.write( "65q = 780
\n" ); document.write( "q = 12
\n" ); document.write( "d = 6
\n" ); document.write( "n = 3
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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