Out of three numbers the average of the first and the second number is 37 more than the average of the second and the third number. What is the difference between the first and the third number?

- The average age of 22 girls is 40 years. If the age of two more girls is added the average decreases by 2.5 years. What is the sum of the age of new girls?
- Average 20 numbers is ‘x’. If the average of first 12 numbers is 72.5 while average of last 5 numbers is 82.2 and 13
^{th}, 14^{th}and 15^{th}numbers are (3x - 42), (x + 50) and 183 respectively. Find the 14^{th}number. - The average number of sweets distributed in a class of 90 students is 6. If lsquo;xrsquo; number of students newly joined the class and the average becomes 5, and then find the newly joined students in the class?

- The batting average of 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest by 172 runs. If the two are excluded, the average of the remaining 38 innings is 48runs. Find the highest score of the player?
- In an examination the average marks of Rohit is 63. If he got 20 more marks in science and 28 more marks in maths then his average would have been 69. Find the total number of subjects he studied?
- The average temperature of Monday, Tuesday, Wednesday and Thursday is 50°. The average temperature for Tuesday, Wednesday, Thursday and Friday is 60°. If the ratio of temperature for Monday and Friday is 1 : 5, then what is the temperature of Friday?
- The average of first three numbers of a set of six numbers is 60 .The average of the second, third and fourth numbers is 20 and the average of the third, fourth and fifth numbers is 30. The average of last three numbers is 40. What is the average of first three and last three numbers of the set?
- Average age of A, B and C is 20 years. Average age of B and C was 12 years when A was born. If B is 21 years old, then, find the age of C, 6 years hence.
- In a school with 400 students, the average of the age of the boys is 16 years and that of the girls is 12 years. If the average age of the school is 14 years 9 months. Then the number of girls in the school is.
- The average age of 13 girls is 40 years. If the age of one more girl is added the average decreases by half a year. What is the age of new girl?

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