10. The sum of ages of A, B and C i...
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10. The sum of ages of A, B and C is ni 93 yr. Ten years ago, the ratio of their ages was 2:3:4. Find the present age of A. RRB NTPC (Phase-1) 2016 (1) 7 yr (2) 14 yr (3) 24 yr (4) 18 yr

11th - 12th Class
Maths
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10. (3) Let the ages of ( A, B ) and ( C ) ten years ago be ( 2 x, 3 x ) and ( 4 x ) years, respectively. Then, according to the question, [ (2 x+10)+(3 x+10)+(4 x+10)=93 ] ( Rightarrow quad 9 x+30=93 ) ( Rightarrow quad 9 x=63 Rightarrow x=7 ) Thus, present age of ( A=2 x+10 ) ( =2 times 7+10=24 mathrm{yr} )
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