Quantitative an...

If x/15 * x / 135 = 1, then x is equal to

A shopkeeper purchased 70 books at the rate of Rs. 2 per book. Out of these, 2 books were damaged. At what rate should he sell the remaining books to earn 20% profit?

If 25% of a number is greater than another number by 5 and the sum of the numbers is 70, then what is the ratio of the larger number to the smaller number?

The average of 6 numbers is 19. If the average of 5 of these is 20, then what is the sixth number?

1/5 of 2/3 of 6/7 of a number is 8. What is the number?

An alarm clock gives out siren as follows. One time at 1 o`clock, 2 times at 2 o`clock, 3 times at 3 o`clock and so on. Further, it gives siren only once at half-past an hour. During a span of 24 hours, how many times would it give the siren?

An autorickshaw charges Rs. 4.50 up to the first 2 km and then, Rs. 0.60 for every km thereafter. If a person travels `k` km (k > 2), then how much would he have to pay?

An elevator has a capacity of 12 adults or 20 children. How many adults can board the elevator with 15 children?

Find the sum of the following series.

20 + 21 + 22 + … + 50

A wholesaler charges the price of 27 pens for 30 pens to a retailer. The retailer sells them at the marked price. What is the gain for the retailer?