Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

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

If x+1x:x-1x=5:3 then the value of x is

A person crosses a 900 metres wide road in 120 seconds. What is his speed (in km/hr)?

Working together A and B can do a job in 40 days, B and C in 36 days and all three together in 24 days. In how many days can B alone do the job?

In the following question, select the odd letters from the given alternatives.

Azhar is 4 times as good a workman as Balaraj and therefore is able to finish a job in 45 days less than Balaraj. Working together, they can do it in:

The marked price of a pencil is 35% more than its cost price. What maximum discount percentage can be offered by the shopkeeper to sell his pencil at no profit or no loss?