Quantitative Aptitude - Arithmetic Ability Questions

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 together do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?

The largest 5 digit number exactly divisible by 84 is:

What is the value of cosec 5π/3?

From a point P on a level ground , the angle of elevation to the top of the tower is 30° . If the tower is 100m high , the distance of point P from the foot of the tower is ( Take √3 = 1.73)

If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2)

If 123 x 356 = 43788, then 1.23 x 0.356 = ?

The third proportional of two numbers 12 and 48 is