Quantitative Aptitude - Arithmetic Ability Questions

A canal of a village can be cleaned by 24 villagers in 12 days. The number of days in which 36 villagers can clean the canal is ?

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

A merchant marks the price of his articles 30% above the cost price. He gives some discount on it and earns a profit of 13.75%. What is the discount percentage?

25% discount is offered on an item. By applying a promo code the customer wins 22% cash back. What is the effective discount?

Triangle ABC is similar to triangle PQR and AB : PQ = 2 : 3. AD is the median to the side BC in triangle ABC and PS is the median to the side QR in triangle PQR. What is the value of (BD/QS)2?

A square ground is to be covered by planting 100 saplings on each side. How many saplings are needed in all?

If 2x+29x = 4, then the value of 27x3+127x3

If a3- b3= 91 and a - b = 1, then what is the value of ab?