Question
The average age of a group of 10 students is 20
years. Two persons of age 25 years and 20 years, left the group and 2 persons of age 26 years and 29 years, joined the group. Find the new average age of the group.Solution
Required average = {(10 × 20) – 25 – 20 + 26 + 29}/10 = 21 years
Quantity of milk is 40% more than that of water in 240 litres mixture (milk + water). If 18 litres milk is added, then find the quantity of milk in the ...
Mixture X has acid and petrol in the ratio 11:9. Mixture Y has 25% acid, the rest water. If 36 litres of mixture X is blended with 24 litres of mixture ...
A 200 litres mixture of juice and water contains 30% juice. How much water should be added to the mixture to make the quantity of water 80% of the total...
A 450 ml solution is composed of water and glucose mixed in the ratio of 8:7. Determine the amount of glucose that must be added to the solution so that...
- Metal mixture ‘C’ consists of mercury and platinum in the ratio 2:3. Another alloy ‘D’ includes platinum and titanium in the ratio 1:4. If 25 grams...
A metal alloy is composed of 25% silver, 45% gold, and 30% copper. How much silver should be added to 50 kg of the alloy to make the new alloy contain 4...
A mixture contains milk and water in the ratio 4:5, respectively. If half of the mixture is replaced with 5 litres of water, then the resultant mixture ...
In a tank, milk and water are mixed in the ratio 5:2. After removing 35 litres of this mixture, 6 litres of water are added. If the resulting mixture ha...
A mixture consists of (k+16) liters of milk and (2k+12) liters of water. After adding 8 liters of milk and 20 liters of water to ...
A factory has a mixture containing 60% iron and 40% copper. If 20 kg of copper is added, resulting in a mixture that is 50% iron, what was the initial w...
Relevant for Exams:
