Quantitative Aptitude - Arithmetic Ability Questions

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

56/32 simplified value?

A batsman scores 87 runs in the 21st match of his career. His average runs per match increases by 2. What was his average before the 21st match.

A cistern has one inlet, L and one inlet, M. L takes 5 hours to fill the empty tank, when M is not open and M takes 8 hours to empty the full tank, if the tank is two fifth full, how much time will it take to fill the tank completely when both L and M are opened simultaneously? (in hours)

A and B have to type a book together containing 120 pages. A takes 9 hrs to type 36 pages and B takes 5 hrs to type 40 pages. A typed first 60 pages alone and the last 60 pages were typed by A and B together. How much time (in hours) will be taken to type the complete book?

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

What is the value of [12/(√5 + √3)] + [18/(√5 – √3)]?

If A's salary is 40% less than that of B, then how much percent is B's salary more than that of A?