Quantitative Aptitude - Arithmetic Ability Questions

The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is:

The value of(1(p-n)(n-q)+1(n-q)(q-p)+1(q-p)(p-n)) is

If p and q are the roots of the equation x2 –15x + r = 0 and p –q = 1, then what is the value of r ?

If Rs 7,800 is to be divided between A, B and C in the ratio 1/2 : 1/3 : 1/4, then how much share will B get (in Rs)?

A wholesaler had 200 dozens of mangoes. He sold some of these mangoes at 20% profit and the rest at 10% profit, so that he made 13% profit on selling all the mangoes. How many mangoes (in dozens) did he sell at 20% profit?

25% discount is offered on an item. By applying a promo code the customer wins 4% cash back. What is the effective discount?

A carpenter can build a cupboard in 48 hours. After 12 hours he takes a break. What fraction of the cupboard is yet to be built?

Mohit sells a table at a profit of 25%. If he reduces its selling price by Rs 240, then he suffers a loss of 5%. What was the initial selling price (in Rs) of the table?