Quantitative Aptitude - Arithmetic Ability Questions

A and B can do a piece of work in 72 days. B and C can do it in 120 days and A and C can do it in 90 days. A alone can do it in:

Which of the following quadratic equations has real roots?

In the following question, select the odd letter/letters from the given alternatives.

Find the odd word/letters/number from the given alternatives.

Rahul can complete a work in 18 days and Sonu can complete the same work in 15 days. If both together work for 5 days, then what part of total work is left?

If cos 60° - sec 30° = x, then the value of x is

What sum will produce the same interest in 9 years at the rate 8% simple interest as Rs. 800 producein 3 years at 9/2% per annum?

What is the simplified value of (cosec A + sin A)(cosec A – sin A)?