Quantitative Aptitude - Arithmetic Ability Questions

If (X/4) = (Y/5) = (Z/9), then what is X : Y : Z?

The ten's digit of a 2­digit number is greater than the units digit by 4. If we subtract 36 from the number, the new number obtained is a number formed by interchange of the digits. Find the number.

A shopkeeper increases the price of an object by 40% and then sells it at 25% discount on the marked price. If the selling price of such an object be Rs. 2100, its cost price for the shopkeeper was ?

A can do a piece of work in 9 days while B can do it in 12 days. A and B together can do the work in

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

A triangle has a perimeter of 200. If two of its sides are equal and the third side is 20 more than the equal sides, what is the length of the third side?

If a - b = 1 and ab = 6, then what is the value of a3- b3?

If P = 99, then the value of P(P2+ 3P + 3) is