Question
The population of a city is decreased by 14% in the
first year and then increased by 25% in the second year. Find the population of the city at the end of the second year, if two years ago the population was 16,000.Solution
Required population = 16000 × 0.86 × 1.25 = 17200
In the Board exams, the average marks scored by 20 students is 55. But while calculating, marks of 2 students were wrongly entered as 43 and 60 in place...
Average run scored by a batsman in 60 innings is 180. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases...
A group of people contains men, women, and children. If 40% of them are men, 35% are women, and the rest are children, and their average weights are 70 ...
The average number of books on history, polity and geography in a library is 144, and the average number of books on history and geography is 140. If th...
There are three distinct numbers ‘a’, ‘b’ and ‘c’. If, a = 150, (a + b) = 450 and (c – b) = 60, then find the average of a, b and c.
...- The average of three numbers is 66. When three more numbers are included, the average increases by 6. Find the average of the numbers included.
The average cost of 4 chairs is Rs. 11000. The average cost decrease by 15% when one more chair is included. What is the cost price of the 5th
- What is the average of the squares of the first 25 natural numbers?
The average cost of 3 chairs is Rs. 8000. The average cost decrease by 20% when one more chair is included. What is the cost price of the 4th...
If a:b:c = 3:4:6, and (5a + 3c) = 132, then find the value of '3b'.
Relevant for Exams:
