Question
The average age of a class of 22 girls is 18 years. If 2
new girls having average age of 12 years join the class, then the average age of the class becomes:Solution
Total age of 22 girls = 22 × 18 = 396 years Total age of 24 girls = 396 + (2 × 12) = 420 years Therefore new average age = 420/24 = 17.5 years
How many numbers in the range from 300 to 900 are divisible by 7, 14, and 28?
Â
The mean of 12 numbers is 15. When two additional numbers, x and y , are included, the average increases by 1. Given that the difference between x and y...
- Ajay’s income is Rs. 50000. He spent Rs. 15000 less than the amount he managed to save. Find the percentage of income he used for expenses.
- The smallest number 'Q' which when divided by 12, 16, and 20 leaves 5 as the remainder in each case. Find the value of ('6Q' + 15).
- In a list of nine even consecutive integers, the smallest number is 25% less than the largest number. Find the total of the second smallest and the second ...
Three natural numbers are such that one-third of the first number is equal to two-fifths of the second, and two-thirds of the second number is equal to ...
- If median is 6 more than the mean, then find the difference between mode and median.
- How many numbers between 200 and 1000 are divisible by both 20 and 30?
Two friends received a bonus of ₹3,000 each in their bank accounts. They already have ₹47,000 and ₹57,000 in their respective bank accounts. The r...