Question
A 88-litre mixture contains only water and oil in the
ratio 6:5, respectively. If 22 litres of the mixture is replaced with the same quantity of oil, then find the quantity of oil in the final mixture.Solution
Amount of oil in the mixture = 88 × (5/11) = 40 litres Amount of oil withdrawn = 22 × (5/11) = 10 litres Quantity of oil in the final mixture = 40 – 10 + 22 = 52 litres
The average weight of 8 students in a class is (x + 15). If the average of the first four students is 30 kg and the average of the last four students is...
The average age of a group of nine children is 7 years. From the group, three children, whose ages were 3 years more, 2 years more, and 4 years more tha...
Find the average of prime numbers between 20 and 40.
Average age of 16 students is 18 years. If 4 students leave the class, then the average age decreases by 1.5 years. Find the average age of the students...
The average weight of 4 persons is 46 kg. The heaviest person’s weight is 28 kg more than the lightest person’s weight. If the average weight of the...
Mixture X comprises juice and water in a 5:4 ratio, and mixture Y consists of juice and water in a 7:9 ratio. When mixture X is combined with mixture Y,...
Average marks scored by Vineet in five subjects are 80. The average marks scored by him (excluding his highest and lowest marks) are 72 and lowest marks...
The average age of three children is 20 years. If their ages are in the ratio 5:6:9. Find the age of the youngest child.
In an office, there are 52 employees with an average weight of 38 kg. When the office manager's weight is included, the average w...
The average speed of a vehicle for a certain number of hours is 48 km/hr. If the vehicle travels 120 km in the next hour, the average increases by 2 km/...
Relevant for Exams:
