The average marks secured by 36 students was 52. But it was discovered that an item 64 was misread as 46. What is the correct mean of marks

The average marks secured by 36 students was 52. But it was discovered that an item 64 was misread as 46. What is the correct mean of marks
1). 54
2). 53.5
3). 53
4). 52.5

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1. Four years ago, average age of Suresh and Ramesh was 36. The average age of today along with their friend Mahesh is 40. The age of Mahesh after 7 years is________

2. A batsman makes 100 runs in the 25th match of his career. His average runs per match increases by 1.4. Find his average before the 25th match.

3. The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:

4. The average height of A, B and C is 148 cm. If the average height of A and B is 136 cm and that of B and C is 125 cm, then what is the height (in cm) of B?

5. In the first 45 overs of a 50 over innings, the run rate was 5.8 runs per over. What is the required run rate in the remaining overs to reach the target of 295 runs?

6. A batsman makes a score of 87 runs in the 17th innings and thus increased his average by 3. Find his average after 17th innings.

7. The ratio of ducks and frogs in a pond is 35 : 43 respectively. The average number of ducks and frogs in the pond is 234. How many ducks are there in the pond?

8. The average marks of 45 students was 70 for a unit test. It was noticed that 20th roll number student marks which is 45 was wrongly taken as 60. Then the corrected new average marks - 

9. There are 50 students in a class. One of them weighing 50kg goes away and a new student Joins. By this the average weight of the class increases by $\frac{1}{2}$ kg. The weight of the new student is:

10. The average of 8 numbers is 20.The average of first two numbers is $15\frac{1}{2}$ and that of the next three is $21\frac{1}{3}$.If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is :