document.write( "Question 1152652: in four years time khairul's mother will be three times as old as khairul.six years ago,his mother was seven times as old as him.find:khairul's present age,the age of his mother when he was born \n" ); document.write( "

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\n" ); document.write( "in four years time khairul's mother will be three times as old as khairul.six years ago,his mother was seven times as old as him.find:khairul's present age,the age of his mother when he was born
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Let mother's and Khairul's ages be M and K, respectively
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document.write( "Then we get: M + 4 = 3(K + 4)____M = 3K + 8 ----- eq (i)
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document.write( "M - 6 = 7(K - 6)____M = 7K - 36 ----- eq (ii)
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document.write( "3K + 8 = 7K - 36 ------ Equating eqs (i) & (ii)
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document.write( "3K - 7K = - 36  - 8
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document.write( "- 4K = - 44
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document.write( "K, or \r
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document.write( "M = 3(11) + 8 ------ Substituting 11 for K in eq (i)
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document.write( "M, or mother is 33 + 8 = 41 years-old
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document.write( "The difference in their ages is: 41 - 11 = , and so thatw's the age of the mother upon Khairul's birth. \n" );
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