Quantitative Aptitude - Arithmetic Ability Questions

Murad can do a piece of work in 33 hours. If he is joined by Joel who is 100% more efficient, in what time will they together finish the work?

A merchant buys 25 litres of milk daily at the rate of Rs.12 per litre. He mixes 5 litres of water in it and sells at the rate Rs.10.40 per litre. His gain/loss is:

If cosecA + cotA = x, then value of x is

2/3 of a milk-water mixture was milk. There was 21 lit of the mixture. If 4 lit of water is added to it, the % of milk in the new mixture will be:

Two people A and B are at a distance of 260 km from each other at 9:00 a.m. A immediately starts moving towards B at a speed of 25 km/h and at 11:00 a.m. B starts moving towards A at a speed of 10 km/hr. At what time (in p.m.) will they meet each other?

20% discount is offered on an item. By applying a promo code the customer wins 5% cash back. What is the effective discount?

How many times the keys of a typewriter have to be pressed in order to write numbers from 121 to 1346?

Sum of four consecutive odd numbers is 208. Find the largest number.