Quantitative Aptitude - Arithmetic Ability Questions

If 5x = 30-y = 6z, then what is the value of (xy + yz + zx)/xyz?

If a/b = c/d = e/f = 2/5, then what is (5a + 3c + 2e) : (5b + 3d + 2f)?

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 4 days. How long B alone would take to do the whole work?

The average revenues of 11 consecutive years of a company is Rs 69 lakhs. If the average of first 6 years is Rs 64 lakhs and that of last 6 years is Rs 76 lakhs, what is the revenue for the 6th year?

From a container of milk, 5 litres of milk is replaced with 5 litres of water. This process is repeated again. Thus in two attempts the ratio of milk and water became 81 : 19. The initial amount of milk in the container was

The sum of the digits of a 2-digit number is 11. If we add 45 to the number, the new number obtained is a number formed by interchange of the digits. What is the number?

The mode and median of the data 8, 6, 8, 7, 8, 6, 8, 7, 6 is

A vendor buys bananas at 7 for Rs 6 and sells at 6 for Rs 7. What will be the result?