The average of first ‘n’ natural numbers is 243. What is the average of the first ‘3n’ natural numbers?

The average of first ‘n’ natural numbers is 243. What is the average of the first ‘3n’ natural numbers?

1). 727
2). 728
3). 729
4). 730

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1. From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this change, the average age of the boys in that class increases by 2 months, the age of the newcomer is :

2. Find the average of 1.11, 0.01,0.101, 0.001, 0.11

3. The average weight of 15 students in a class increases by 1.5kg when one of the students weighing 40 kg is replaced by a new student. What is the weight (in kg) of the new student

4. 5 years ago, the average age of A ,B, C and D was 45 years. With E joining them now, the average age of all the five is 49 years. How old is E

5. Among three numbers,the first is twice the second and thrice the third.If the average of the three numbers is 49.5,then the difference between the first and the third number is

6. A school has 4 sections of Physics in Class XI having 45, 30, 50 and 52 students. The mean marks obtained in Physics test are 60, 75, 55 and 80 respectively for the 4 sections. Determine the overall approximate average of marks per student

7. A survey was conducted over a group of 900 people asking about their usage of mobile, laptop and tablet. The average number of users that are using only one of them is 107, while 168 users are using all of the three items. If the total number of people using none of them is 5, how many users are using only two of the items?

8. Out of the 3 numbers whose average is 80, the first is 1/7 times the sum of other 2. The first number is

9. In an engineering collage the average salary of all engineering graduates from Chemical trade is Rs. 2.45 lacs per annum and that of the engineering graduates from electronics trade is Rs. 3.56 lacs per annum, the average salary of all Chemical and Electronics graduates is Rs. 3.12 lacs per annum. Find the least number of Electronics graduates passing out from this institute. 

10. Average weight of 25 persons is increased by 1 kg when one man weighing 60 kg is replaced by a new person. Weight of new person is :