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Here, the present perfect continuous tense should be used. The brother started asking two years ago and is going on asking at present.
378 ml of mixture ‘A’ contains milk and water in the ratio 4:5 respectively. If the quantity of milk in mixture ‘B’ is 37.5% mor...
A container contains 60 liters of a solution containing 25% alcohol. How many liters of pure alcohol must be added to make the alcohol concentration 40%?
A mixture of milk and water contains 30% water. On adding 18 litres of water, the quantity of milk becomes 50% more than that of water. Find the initial...
There are two mixtures, 'I' and 'J' of milk and water. Total quantity of mixture 'I' and mixture 'J' are 9 litres and 21 litres, respectively. Mixture '...
Quantity of water in a 400 litres mixture (alcohol + water) is 40 litres less than the quantity of alcohol in it. Find the quantity of water to be mixed...
In a 168-litre mixture, the proportion of milk to honey is 5:2. If 'p' litres of honey are added to this mixture, making the new ...
155 litres of a mixture contains 42% milk and rest water. If ‘x’ litres of milk is added into the mixture then quantity of water in the final mixtur...
A man initially has a mixture of milk and water, with 80% of the mixture being milk. He sells 20 litres of this mixture and replaces it with the same a...
A 30-litre mixture consists of milk and water in the ratio of 5:7. To this mixture, 2.5 litres of milk and 4.5 litres of water are added. How much more ...