Quantitative Aptitude - Arithmetic Ability Questions

A, B and C can complete a work in 10, 12 and 15 days respectively. All three of them starts together but after 2 days A leaves the job and B left the job 3 days before the work was completed. C completed the remaining work alone. In how many days was the total work completed?

If the radius of a circle is increased by 25%, its area increases by:

In a mixture of 35 litres, the ratio of milk and water is 4:1. If 7 litres of water is added to the mixture, the ratio of milk and water of the new mixture will be

A sum of Rs 3170 is divided among X, Y and Z such that if Rs 13, Rs 12 and Rs 18 will be diminished from the shares of X, Y and Z respectively, then their shares will be in the ratio 20 : 18 : 21. What is the initial share (in Rs) of Z?

Nirmit can do 2/3 of a job in 18 days. Kashish is twice as efficient as Nirmit. In how many days Kashish will complete the job?

G is twice as fast as S in doing work. If G can do a work in 30 days less than S, how many days will they take to complete the work together?

If a=x13y13+x-13y-13then a3-3ay-x is equal to

If the radius of a circle is increased by 29% its area increases by