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O years ago, age of B was 10 times of theage of C. If ratio of their present ages is 4: 1. What is the age of B at present ?(1) 10 year(3) 60 year(5) of these [R.O. 1989, RRB 2008]12. 1(2) 40 year(4) 80 year |
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Answer» (B-10)=10(C-10)B-10=10C-100B-10C=-90B/C=4/1B=4C4C-10C=-90-6C=-90C=15so.B=4×15=60 |
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