The average of five numbers is 57.8. The average of the first and the second number is 77.5 and the average of the fourth and the fifth number is 46. What is the third number?

Mr Nair's monthly salary is Rs. 22,500. He took a loan of Rs. 30,000 on simple interest for 3 years at the rate of 5 p.c.p.a. The amount that he will be paying as simple interest in 3 years is what percent of his monthly salary?

If the numerator of a certain fraction is increased by 100% and the denominator is increased by 200% the new fraction thus formed is $4\over21$ . What is the original fraction?

52% students from a college participated in a survey. What is the ratio of the number of students who did not participate in the survey to the number of students who participated?

Yesterday Shweta completed 300 units of work at the rate of 15 units per minute. Today she completed the same units of work but her speed was 40% faster than yesterday. What is the approximate difference in the time she took to complete the work yesterday and the time that she took today?

The average speed of a bus is 8 times to the average speed of a bike. The bike covers a distance of 186 km in 3 hours. How much distance will the bus cover in 10 hours?