document.write( "Question 114472: The age of Mary and Claire are in the ratio 5:7. Four years later their age will be in the ratio 3:4. Find their ages . please help me with this sum i am kind of getting confused and thanks! \n" ); document.write( "
Algebra.Com's Answer #83321 by stanbon(75887)\"\" \"About 
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The age of Mary and Claire are in the ratio 5:7. Four years later their age will be in the ratio 3:4. Find their ages
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\n" ); document.write( "NOW DATA:
\n" ); document.write( "Mary is 5x yrs. old ; Claire is 7x yrs old.
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\n" ); document.write( "4 years later DATA:
\n" ); document.write( "Mary is 5x+4 yrs old ; Claire is 7x+4 yrs old
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\n" ); document.write( "EQUATION:
\n" ); document.write( "(5x+4)/(7x+4) = 3/4
\n" ); document.write( "Cross-multiply to get:
\n" ); document.write( "4(5x+4) = 3(7x+4)
\n" ); document.write( "20x+16 = 21x+12
\n" ); document.write( "x = 4
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\n" ); document.write( "Ages NOW:
\n" ); document.write( "Mary = 5x = 20 yrs old
\n" ); document.write( "Claire = 7x = 28 yrs old
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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