Quantitative Aptitude - Arithmetic Ability Questions

A does 30% of a work in 30 days. He then calls in B and they together finish the remaining work in 20 days. How long B alone would take to do the whole work?

The sum of money that will yield Rs. 60 as simple interest at 6% per annum in 5 years is

If 5x + 1/x = 10, then x2 + 125x2 is equal to

A boy found the answer for the question "Subtract the sum of 1/4 and 1/5 from unity and express the answer in decimals" as 0.45. The percentage of error in his answer was

Kamal has some apples. He sold 40% more than he ate. If he sold 70 apples, how many did he eat?

Mr. Mike borrowed Rs. 8500 at 4% per annum C.I. The C.I. compounded annally for 2 years is :

x, y and z are prime numbers and x + y + z = 38. What is the maximum value of x?

In two types of brass, the ratios of Copper to Zinc are 8:3 and 15:7 respectively. If the two types of brass be melted and mixed in the ratio 5:2 a new type of brass is obtained. The ratio of Copper to Zinc in this new type of brass is