Quantitative Aptitude - Arithmetic Ability Questions

Both A and B together can complete a work in 20 days and B alone can complete the same work in 36 days. In how many days will A alone complete the work?

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

A and B have their annual average income Rs. 80,000.
B and C have their annual average income Rs. 75,000.
C and A have their annual average income Rs. 78,000.

The annual income of A is ?

Find the degree of the polynomial 8x4 + 2x2y3 + 4

The value of x for which the expressions 15 ­ 7x and 15x + 7 become equal is _____.

What is the value of (cosecA - cotA) / (secA + tanA)?

If 493/29 = 17, then 4.93/0.0017 = ?

If x – 4y = 0 and x + 2y = 24, then what is the value of (2x + 3y)/(2x – 3y)?