Question
The average of the current ages of Armaan, Biju, Chinky,
and Danny is 31 years. Two years from now, the average age of Armaan and Biju will be 22 years. Given that the present age ratio of Chinky to Danny is 4:3, determine the current age of Danny.Solution
ATQ, Sum of the present ages of ‘Armaan’, ‘Biju’, ‘Chinky’ and ‘Danny’ = 31 × 4 = 124 years Sum of the ages of ‘Armaan’ and ‘Biju’, 2 years hence = 22 × 2 = 44 years Sum of the present ages of ‘Armaan’ and ‘Biju’ = 44 – 2 – 2 = 40 years Sum of the present age of ‘Chinky’ and ‘Danny’ = 124 – 40 = 84 years Present age of ‘Danny' = 84 × {3/(4 + 3)} = 36 years
100 litres of mixture contains water and milk in the ratio 2:3 respectively. If 20 litres of the mixture is replaced by same quantity of water, then fin...
In a liquid solution, there is 300 ml of alcohol, which makes up 60% of the total volume. After removing 60 ml of the mixture, 48 ml of water is added. ...
A mixture weighing 600 grams consists of sand and cement in a ratio of 3:7. If an additional 20 grams of sand and 80 grams of cement are added to it, wh...
A solution contains alcohol and water in the ratio 5:2. If 25% of the solution is replaced with the same amount of water, what will be the new ratio of ...
- A drum is filled with 840 litres of syrup and water in the ratio 2:5. If ‘k’% of the total solution is withdrawn and the water taken out is 210 litres,...
- Alloy ‘P’ has aluminium and nickel in a 7:9 ratio. Alloy ‘Q’ is made up of nickel and zinc in a 4:6 ratio. If 48 grams of ‘P’ and 60 grams of �...
640 litres of mixture ‘A’ contains milk and water in it. If mixture ‘A’ is mixed with 560 litres of mixture ‘B’ which contains water and sal...
- In a 120-litre chemical mixture, the chemicals A and B are in the ratio 5:7. How much of chemical A must be added to make the ratio 7:7 (i.e., equal amount...
- 48 grams of an alloy 'A' containing only gold, silver and copper in ratio 1:1:4 respectively is mixed with 30 grams of alloy 'B' which contains only silver...
One alloy of steel contains 74% Iron and 26% carbon. Another alloy contains 81% Iron and 12% carbon. Later, they are mixed, so that the mixture contains...
