Let the average age of Boys be ‘x’ According to question, x × 16 + (400 - x) × 12 = 400 × 14(3/4) 16x + 4800 - 12x = 400 × 59/4 4x + 4800 = 5900 4x = 1100 x = 275 Number of girls = 400 - 275 = 125 Alternate Method: By Alligation, Boys Girls 16 12 59/4 59/4 - 12 : 16 - (59/4) 11/4 : 5/4 11 : 5 So Number of girls = 5/(5+11) of 400 = 5/16 of 400 = 125
A mixture consisting of 360 liters contains petrol and diesel in a ratio of 5:4, respectively. After removing 7.5% of the mixture and replacing it with ...
A jar contains a mixture of mango juice and water in the ratio of 5:2. 84 litres of the mixture was taken out and 34 litres of water was added to it. I...
A 160-litre mixture contains petrol and water, only in ratio 5:3, respectively. How much water should be added in the mixture so that the quantity of wa...
In a vessel the ratio of alcohol to water is 6:1. If 21 liter of mixture is taken out from the vessel and 1 liter water is added, then the ratio of alco...
420 ml of mixture ‘B’ contains only water and milk in the ratio of 7:13, respectively. If the quantity of milk in mixture ‘A’ is 20% more than t...
Mixture 'A' contains milk and water in the ratio of 5:9, respectively, while Mixture 'B' consists of water and milk in the ratio of 11:14, respectively...
150 litres of mixture contains water and milk in the ratio 3:5 respectively. If 54 litres of the mixture is replaced by same quantity of water, then fin...
Mixture 1 with a volume of 8 liters has 80% milk and Mixture 2 with a volume of 7 liters has 70% milk. Both the mixtures are mixed. Find the percentage ...
55% of the original 'a' liters of pure petrol is taken out from a container and replaced with 66 liters of Methanol, ensuring the total quantity of the ...
A mixture of milk and water measures 60 litres. It contains 10% water. How much water should be added to it, so that the water may be 25%?
