What will be the average of odd numbers between 20 to 74?

Odd numbers between 20 to 74. ⇒ 21, 23, 25……………………………….73. Clearly, this is a series of consecutive odd numbers. ∴ According to the formula Average of consecutive numbers = (first number + last number)/2 = (21 + 73)/2 = 94/2 = 47

- Out of 4 numbers, the average of first 3 is 19 and last 3 is 20. If the last number is 21. Find the first number?
- 2 years ago, the average age of the family of 3 members is 13 years. A baby is born now; the average age of the family is same as before. Find the age of the baby?
- In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?
- The average age of a group of 20 students is 40 years. Two persons of age 44 years and 33 years, left the group and 2 persons of age 45 years and 72 years, joined the group. Find the new average age of the group.
- The average expenditure of a man for the first seven month is Rs.12000 and for the next five months is Rs.9000. If he saves 15000 in that year then find his average monthly income.
- The average age of 23 children and their teacher's age are 21 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
- Average run scored by a batsman in first ‘x’ matches is 70. In next 12 matches he scored runs with an average of 90 so that his overall average increased by 5. Find the value of x.
- The average age of a class of 20 girls is 15 years. If 5 new girls having average age of 10 years join the class, then the average age of the class becomes:
- The average cost of 3 chairs is Rs. 9500. The average cost decrease by 15% when one more chair is included. What is the cost price of the 4
^{th}chair? - Average of four numbers is 18. Sum of smallest and largest number is 32. If difference between other two numbers is 2, then find the square of second smaller number.

More Average Questions

×