The average income of 40 persons is Rs 4200 and that of another 35 persons is Rs 4000. The average income of the whole group is:

The average income of 40 persons is Rs 4200 and that of another 35 persons is Rs 4000. The average income of the whole group is:
1). Rs 4100
2). Rs $4106\frac{1}{3}$
3). Rs $4106\frac{2}{3}$
4). Rs $4108\frac{1}{3}$

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Other Questions

1. Find the average increase rate if increase in the production of cloths in the first month is 20% and that in the second month is 25% and in the third month is 15%.

2. Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 yr joins. As a result average age of teachers reduces by 3 yr. The age of the retired teacher is 

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6. In a class of 60 students there are 30 girls. The average weight of these girls is 58 Kg and average weight of the full class is 63 kgs. What is the average weight of the boys of the class?

7. A man buys 7 shirts at Rs. 300 each, 2 trousers at Rs. 450 each and 1 pair of shoes at Rs. 500 each. What is the average expenditure (in Rs) per article?

8. In an exam , the average marks obtained by the students was found to be 60. After omission of computational errors, the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks. The total number of candidates who took the exam, was

9. The average of 30 results is 20 and the average of other 20 results is 30. What is the average of all the results

10. Of the three numbers,the first is 3 times the second and the third is 5 times the first.If the average of the three numbers is 57,the difference between the largest and the smallest number is