Quantitative Aptitude - Arithmetic Ability Questions

Mahmood can do a piece of work in 40 hours. If he is joined by Janaki who is 50% more efficient, in what time will they together finish the work?

Smita can finish a work in 12 days and Sam can finish the same work in 9 days. After working together for 4 days they both leave the job. What is the fraction of unfinished work?

Of the 5 numbers whose average is 78, the first is 2/11 times the sum of other 4. The first number is

If 8/5 of 4/3 of a number is 192, then 5/6 of that number is

A number is greater than five times its reciprocal by 19/2. Find the number.

To cover a distance of 252 km in 2.5 hours what should be the average speed of the car in meters/second?

25% discount is offered on an item. By applying a promo code the customer wins 22% cash back. What is the effective discount?

What is the simplified value of cosec 2A + cot 2A?