List of top Quantitative Aptitude Questions

A tank of capacity 25 litres has an inlet and an outlet tap. If both are opened simultaneously, the tank is filled in 5 minutes. But if the outlet flow rate is doubled and taps opened the tank never gets filled up. Which of the following can be outlet flow rate in litres/min?

Persons A and B decide to arrive and meet sometime between 7 and 8 pm. Whoever arrives first will wait for ten minutes for the other person. If the other person doesn't turn up inside ten minutes, then the person waiting will leave. What is the probability that they will meet?

In each of these questions, two equations (I) and (II) are given. You have to solve both the equations and give answer:
I. \( 14x^2 - (7 + 2\sqrt{2})x + 3.50\sqrt{2} = 0 \)
II. \( \sqrt{(4y + 1)} - \sqrt{(y + 3)} = 2 \)

When three different varieties of a chemical are mixed in the ratio 3 : 7 : 8, the cost price of the mixture is Rs.\ 15 per litre. However, when the same varieties are mixed in the ratio 2 : 5 : 9, the cost price of the mixture is Rs.\ 18 per litre. What is the cost price of the mixture formed (in Rs.\ per litre) when the same three varieties of chemical are mixed in the ratio 6 : 13 : 5?

What is the next number in the series: 2, 3, 5, 7, 11, ?

Find the value of: \(\frac{\sqrt[3]{3375}+\sqrt{144}}{\sqrt[3]{729}+\sqrt[3]{1728}}\)

If \(P = \frac{1}{2} + \frac{1}{6} + \frac{1}{12} + \frac{1}{20} + \frac{1}{30}\), then find the value of \(\sqrt{6(9-P)}\).

A printer numbers pages of a book starting with 1 and uses 3189 digits in all. How many pages does the book have?

A and B can do a work in 8 days, B and C in 12 days. A, B and C together finish it in 6 days. In how many days will A and C together do it?

The angle between the minute hand and the hour hand of a clock when the time is 4:20 is:

A and B can do a work in 8 days; B and C in 12 days; A, B and C together in 6 days. In how many days will A and C together do it?

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

A train overtakes two persons walking along a railway track. The first walks at 4.5 km/hr; the second at 5.4 km/hr. The train needs 8.4 and 8.5 seconds to overtake them respectively. What is the speed of the train?

A, B and C start a business by investing ₹2000, ₹3000 and ₹4000 respectively. B increases his investment to ₹4000 after 4 months; C withdraws ₹1000 at the end of 9 months. What is A's share of a total profit of ₹8475 earned in a year?

A manufacturer sells glasses to a wholesaler at 18% profit. The wholesaler sells to a retailer at 20% profit. The retailer sells to a customer for ₹30.09 at 25% profit. What is the manufacturer's cost price?

Two musical instruments were purchased for ₹8,000. The first was sold at 40% profit and the second at 40% loss. The sale price was the same in both cases. Find the cost price of the cheaper instrument (₹).

A woman sells to the first customer half her stock and half an apple, to the second customer half her remaining stock and half an apple, and so on to a third and fourth customer. She finds she has 15 apples left. How many apples did she have originally?

The series: single bar → double bar → triple bar → ? (bars shift one position right each step)

In a 3×3 matrix each row uses three different fillings (blank, hatched, solid). Find the missing cell.

The series shows grids: 1×1, 2×2, 3×3, 4×4... with diagonal shading rotating. What comes next?

A matrix of 3×3 figures uses three patterns. The bottom-right is missing. Which option fits?

The top row shows: △ □ ○ △□ △□○. Which answer best continues the binary combination pattern?

Which of the boxes from the given alternatives comes next in the sequence?
Pattern: nested shapes losing one layer per step.

Select the figure that completes the analogy: small circles rotating clockwise by 90°, with one shaded circle moving outward each step.