Quantitative Aptitude - Arithmetic Ability Questions

What is the average of first 19 odd numbers?

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:

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?

After a discount of 23% an article is sold for Rs 1848. What is the marked price (in Rs) of the article?

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

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)?

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

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 ?