document.write( "Question 990521: The average age of father and his son is 54 years and after 10 years the ratio of their ages will be
\n" ); document.write( "3 : 1. So find the present age of father.
\n" ); document.write( "(1) 82 years (2) 84 years (3) 86 years (4) 89 years \n" ); document.write( "
Algebra.Com's Answer #610551 by macston(5194)\"\" \"About 
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\n" ); document.write( "F=father's age; S=son's age
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\n" ); document.write( "(F+S)/2=54yrs
\n" ); document.write( "F+S=108yrs
\n" ); document.write( "S=108yrs-F
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\n" ); document.write( "F+10yrs=3(S+10yrs)
\n" ); document.write( "F+10yrs=3(108yrs-F+10yrs)
\n" ); document.write( "F+10yrs=3(118yrs-F)
\n" ); document.write( "F+10yrs=354yrs-3F
\n" ); document.write( "4F=344yrs
\n" ); document.write( "F=86yrs
\n" ); document.write( "ANSWER: Father's present age is (c) 86 years.
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\n" ); document.write( "CHECK:
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\n" ); document.write( "S=108yrs-86yrs=22yrs
\n" ); document.write( "Son's age is 22 years.
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\n" ); document.write( "F+10yrs=3(S+10yrs)
\n" ); document.write( "86yrs+10yrs=3(22yrs+10yrs)
\n" ); document.write( "96yrs=3(32yrs)
\n" ); document.write( "96yrs=96yrs\r
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