document.write( "Question 699133: The present age of A and his father is in the ratio of 2:5 respectively.4 years hence the ratio of their ages will become 5:11 respectively.what was father's age 5 years ago? \n" ); document.write( "
Algebra.Com's Answer #431193 by ankor@dixie-net.com(22740)\"\" \"About 
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The present age of A and his father is in the ratio of 2:5 respectively.
\n" ); document.write( "\"a%2Ff\" = \"2%2F5\"
\n" ); document.write( "Cross multiply
\n" ); document.write( "5a = 2f
\n" ); document.write( "a = \"2%2F5\"f
\n" ); document.write( "a = .4f
\n" ); document.write( ":
\n" ); document.write( "4 years hence the ratio of their ages will become 5:11 respectively.
\n" ); document.write( "\"%28%28a%2B4%29%29%2F%28%28f%2B4%29%29\" = \"5%2F11\"
\n" ); document.write( "cross multiply
\n" ); document.write( "11(a+4) = 5(f+4)
\n" ); document.write( "11a + 44 = 5f + 20
\n" ); document.write( "11a = 5f + 20 - 44
\n" ); document.write( "11a = 5f - 24
\n" ); document.write( "replace a with .4f
\n" ); document.write( "11(.4f) = 5f - 24
\n" ); document.write( "4.4f = 5f - 24
\n" ); document.write( "24 = 5f - 4.4
\n" ); document.write( "24 = .6f
\n" ); document.write( "f = 24/.6
\n" ); document.write( "f = 40 yrs is Dad's present age
\n" ); document.write( "then
\n" ); document.write( "a = .4(40)
\n" ); document.write( "a = 16 is A's present age
\n" ); document.write( ":
\n" ); document.write( "what was father's age 5 years ago? You can figure that out, I know
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