DELHI POLICE MATHS QUIZ

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Question 1:

Milk was $\frac{4}{5}$ of the milk-water mixture. If 5 liters of water is added to this mixture of total 20 liters, then the percentage of milk in the new mixture will be:

Question 2:

Copper and zinc are melted together in the ratio 11: 9. What is the weight of melted mixture, if 27 kg of zinc has been consumed in it?

Question 3:

An alloy contains 40% of silver, 30% of copper and 30% of nickel. How much silver (in kg) should be added to 30 kg of the alloy so that the new alloy contains 50% of silver?

Question 4:

The ratio of copper and zinc in alloy A is 5 : 7 and that in alloy B is 4 : 5. A and B are taken in the ratio of 1: 2 and mixed to form a new alloy C. What part of C is copper?

Question 5:

Three mixtures containing milk and water in the ratio $5:1,2:1$ and $3:1$ are mixed in the ratio $1:2:3$. Then what will be the ratio of milk and water in the final mixture?

Question 6:

A mixture of acid and water contains 20 percent acid. When 10 litres of water is added to the mixture, then the percentage of acid becomes 15 percent. What is the original quantity of mixture?

Question 7:

Distribute Rs.440 among 80 students such that each boy gets Rs.6 and each girl gets Rs.4. Find the possible number of boys-

Question 8:

Solution A and B are $16 \%$ and $21 \%$ acidic respectively. In what ratio should solution A and B be mixed to obtain a solution which is $19.5 \%$ acidic.

Question 9:

Kartik is drinking a drink which is $120 \mathrm{ml}$ mixture of alcohol and water in which alcohol is $20 \%$ . He adds some water to it, which makes the alcohol $15 \%$ . How much water has been added to the mixture?

Question 10:

75 litres of a solution contains $25 \%$ alcohol and the rest water. If 45 litres of water is mixed in it, then what is the percentage of alcohol in the new solution?