document.write( "Question 762858: The ages of A and B are in the ratio 5:7.Four years from now the ratio of their ages will be 3:4 .Find their present ages. \n" ); document.write( "
Algebra.Com's Answer #464263 by ramkikk66(644)\"\" \"About 
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If A's age is 5*x, B's age is 7*x.\r
\n" ); document.write( "\n" ); document.write( "4 years later, A will be 5*x + 4 years old
\n" ); document.write( "4 years later, B will be 7*x + 4 years old\r
\n" ); document.write( "\n" ); document.write( "It is given that \"%285%2Ax+%2B+4%29%2F%287%2Ax+%2B+4%29+=+3%2F4\"\r
\n" ); document.write( "\n" ); document.write( "Cross-multiplying\r
\n" ); document.write( "\n" ); document.write( "\"20%2Ax+%2B+16+=+21%2Ax+%2B+12\"\r
\n" ); document.write( "\n" ); document.write( "\"x+=+4\"\r
\n" ); document.write( "\n" ); document.write( "So A's age is 20 and B's age is 28.\r
\n" ); document.write( "\n" ); document.write( "Check: In 4 years, A will be 24 and B 32. Ratio will be 3:4.\r
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