Quantitative Aptitude - Arithmetic Ability Questions

The average marks obtained by a group of 10 students were 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.6. What were the average marks obtained by the student who left and the one who joined?

What is the largest 4 digit number which is exactly divisible by 81?

Find the greatest number among 213, 312, 1, 516

The difference between the place values of 9 and 5 in the number 428693745 is

The profit (in Rs.) after selling an article for Rs.524 is the same as the loss (in Rs.) after selling it for Rs.452. The cost price of the article is:

A sum of Rs. 3000 yields an interest of Rs. 1080 at 12% per annum simple interest in how many years ?

The sum of three consecutive natural numbers each divisible by 5, is 225. The largest among them is

If 90% of A = 30% of B and B = x% of A, find x.