Question
Average age of 30 students is 14 years. If 6 students
leave the class, then the average age decreases by 0.5 years. Find the average age of the students who left the class.Solution
ATQ, Total age of 30 students = 30 × 14 years = 420 years. New average age after 6 students leave = 13.5 years. Total age of 24 students = 24 × 13.5 years = 324 years. Total age of the 6 students who left = 420 − 324 years = 96 years. Average age of the 6 students who left = 96/6years = 16 years.
How many numbers lie between 2000 and 3000 divisible by 5 can be made with the digits 2, 3, 4, 5, 6, 7 and 8 without repeating any digit?
The total of five back-to-back even numbers is 150. What’s the value of (cube of the least) – (square of the greatest)?
Sum of squares of three consecutive numbers is 1325. Find the sum of first and third number.
What should come in place of the question mark (?) in the following question?
3/8 × 4/7 ? = 5376
- If the product of three consecutive natural numbers is 1320, then what is their sum?
Find the average of first 14 whole numbers.
- A number when divided by 255 gives remainder 40. Find the remainder when the same number is divided by 15.
- What is the smallest number that must be added to 1500 so that it becomes exactly divisible by 47?
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