UPSC
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Numerical Ability
the weighted average of scores 35 and 55 is 40. how much is the ratio of weights attached to the scores?
A 3:1
B 2:1
C 4:1
D 3:2
Read Solution (Total 4)
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- let wgt is n:m , (35n+55m)/(n+m)=40.
35n+55m=40n+40m.
15m=5n.
3m=n => n/m=3:1. - 10 years agoHelpfull: Yes(3) No(0)
- (35a+55b)/a+b =40
a:b = 3:1 - 10 years agoHelpfull: Yes(0) No(0)
- LET NEW WEIGHT IS 'X'
a/q,
(35+55+X)/3=40
x=30
so ratio =30/120=4:1 - 10 years agoHelpfull: Yes(0) No(1)
- vikash will u please elaborate your answer ..it is wrong dudeeee
- 10 years agoHelpfull: Yes(0) No(0)
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