Quantitative Aptitude - Arithmetic Ability Questions

The average marks of 45 students is shown as 65. It includes a wrong entry of 84 marks instead of 48 marks. The correct average is:

Simple interest on a sum for 5 years is equal to 20% of the principal. In how many years interest will be equal to the principal?

Rizvan walks at 15 km/hr and Ruchitha cycles at 20 km/hr towards each other. What was the distance between them when they started if they meet after 42 minutes?

A can do a work in 12 days and B in 24 days. If they work on it together for 4 days, then what fraction of work is left?

Atul can do a piece of work in 18 days, Aaravya is 50% more efficient than Atul. How much more time does Atul take than Aaravya to do the same piece of work?

If x = 313- 3-13, then 3x2 + 9xis equal to

A shopkeeper marks up his wares by 60% and offers 25% discount. What will be the selling price (in Rs) if the cost price is Rs 1600?

At what percentage above the cost price must an article be marked so as to gain 33% after allowing a customer a discount of 5%?