Mixtures And Alligations

1.400 gm spirit solution has 30 % spirit in it , what is the ratio of spirit should be added to make it 80 % in the solution ?
A)2:5
B)4:3
C)5:2
D)2:7
A)2:5

2.One alloy contains silver and copper in the ratio 5:1 and the other contains in the ratio 7:2 respectively. What weights of the 2 must be melted together, so as to make a 5 lb mass with 80% silver?
A)5:3
B)3:2
C)2:3
D)2:5
B)3:2


3.Box A contains wheat worth Rs.30 per kg and box B contains wheat worth Rs.40 per kg.If both A and B are mixed in the the ratio 4:7 then the price of mixture per kg is
A)36.36
B)35.80
C)42.50
D)31.30
A)36.36


4.In what ratio must a person mix three kinds of Oats costing him Rs 1.20,Rs 1.44 and Rs 1.74 per Kg so that the mixture may be worth Rs 1.41 per Kg?
A)11:77:7
B) 11:45:7
C)25:45:8
D) 27:23:6
A)11:77:7

5.Some amount out of Rs. 10000 was lent at 6 % p.a. and the remaining at 4% p.a. If the total simple interest from both the fractions in 5 years was Rs. 1600, then the ratio of the 2 different amount is
A)1:3
B)3:1
C)1:4
D)3:2
A)1:3