Alligations or Mixture

11 How many kg of sugar costing ₹ 11.70/kg must be mixed with 24 kg of sugar costing ₹ 8.1/kg so that there may be a gain of 15% by selling the mixture at ₹ 9/kg?

12 A mixture of a certain quantity of milk with 16 L of water is worth ₹ 0.75 per litre. If pure milk be worth ₹ 2.25 per litre, then how much milk is there in the mixture?

13 In what ratio must a grocer mix two varieties of pulses costing ₹ 15 and ₹ 20 per kg respectively so as to get a mixture worth I 16.5/kg?

14 600g of sugar solution has 40% sugar in it. How much sugar should be added to make it 50% in the solution?

15 A sum of ₹ 12 is made up of 30 coins which consist of either 50 paise or 25 paise. How many are there of each kind?

16 In what proportion must a grocer mix wheat at ₹ 2.04 per kg and ₹ 2.88 per kg so as to make a mixture of worth ₹ 2.52 per kg?

17 A sum of ₹ 64 is made up of 80 coins which are either 100 paise or 50 paise coins. How many coins are of 50 paise?

18 The ratio of milk and water mixture of four containers are 5 : 3, 2 : 1, 3 : 2 and 7 : 4, respectively. In which container, is the quantity of milk relative to water minimum?

19 In what ratio must a grocer mix two varieties of tea worth Z 60 a kg and ₹ 65 a kg so that by selling the mixture at ₹ 68.20 a kg he may gain 10%?

20 A merchant has 1000 kg of rice, part of which he sells at 8% profit and the rest at 16% profit. He gains 14% on the whole. The quantity sold at 16% profit is: