## 1. The average monthly income of A and B is Rs. 14000, that of B and C is Rs. 15600 and A and C is Rs. 14400. The monthly income of C is :

## 2. The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new average is -

## 3. The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest ?

## 4. A fruit seller sold big, medium and small sizes apples of Rs. 15, Rs. 10 and Rs. 5, respectively. The total number of apples sold were in the ratio 3 : 2 : 5. Find the average cost of an apple.

## 5. Average age of 6 sons of a family is 8 years. Average age of sons together with their parents is 22 years. If the father is older than the mother by 8 years, the age of mother (in years) is -

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