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Numerical Ability
Alligation or Mixture
4 litres of water is mixed in certain amount of pure milk whose cost is Rs. 3 per litre. If the dishonest milkman earns a profit of 20% by selling the mixture at initial price then what is the quantity of pure milk obtained by the customer?
(a) 24
(b) 20
(c) 18
(d) 25
(e) None of these
Read Solution (Total 5)
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- (b); Short Method: 4 litre≡20% of total amount
or, 4×100/20≡total amount or, total amount=20 litre
- 8 years agoHelpfull: Yes(16) No(2)
- cost given = Rs 3/ltr.
i.e cost earned through water mixture= 4*3 = 12 rs
therefore earned 20%, that is on water .. therefore total earned = 12*100/20 = 60 rs.
hence 60/3 = 20 ltr overall mixture! - 8 years agoHelpfull: Yes(10) No(0)
- Answer
let pure milk= x litr.
total mixture=x+4
3x*120/100=(x+4)3
6x-5x=20
x=20 - 7 years agoHelpfull: Yes(4) No(1)
- shortcut
3 0
3/1.2
2.5 0.5
5 1 substract along the diagonal - 8 years agoHelpfull: Yes(2) No(3)
- 300(4+x)=3x*120
x=20 - 8 years agoHelpfull: Yes(0) No(1)
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