What approximate value should come at place of the question mark(?) in the following question?

What approximate values should come in place of the question mark(?) in the following question?

What approximate value should come in place of the question mark(?) in the following question?
5223÷36×0.93=?

The average speed of a train is 3 times the average speed of car. The car covers a distance of 520 km in 8 hours. How much distance will the train cover in 13 hours?

The area of triangle is half the area of square. The perimeter of the square is 224 cm. What is the area of triangle?

28% members of a certain group are married. What is the respective ratio between the number of married members to the number of unmarried members?

The average of five numbers is 49. The average of the first and the second numbers is 48 and the average of fourth and fifth numbers is 28. What is the third number?

Mr. Khanna took a loan of Rs 10,000 on simple interest for two years at the rate 3% per annum. The total amount that he will be paying as interest in 2 year is 3% of his monthly salary. What his monthly salary?