Challenger App

No.1 PSC Learning App

1M+ Downloads
Find the simple interest (in ₹) on ₹3000 as a sum borrowed at 4% per year rate of interest for 3 years.
Area of the base of a right circular cone is 308 cm² and its height is 7√2 cm. Find its curved surface area (in cm²). (Use ∏= 22/7)
The price of 24 movie tickets is ₹768. How much (in ₹) will 32 movie tickets cost? [Assume that all tickets here are equally priced]
A man spends 12% of his income on food, 18% on children's education, and 70% of the remaining on house rent. What percentage of his income is he left with?

The following bar chart shows the income and expenditure (in lakhs) of five companies (P, Q, R, S, T) in the year 2020. The percentage profit or loss of a company is given by:

(Profit or loss) % = 1-E/E × 100; where I = income, E = expenditure

WhatsApp Image 2026-02-17 at 09.40.28.jpeg

If the income of company R in 2020 was 10% more than its income in 2019 and the company had earned a profit of 30% in 2019, then its approximate expenditure in 2019 (in lakhs) was:

A man spends 12% of his income on food, 18% on children's education, and 70% of the remaining on house rent. What percentage of his income is he left with?
A man bought a bullock and a cart for €10,000. He sold the bullock at a gain of 30% and the cart at a loss of 20%, thereby gaining 2% on the whole. Find the cost of the bullock.
The mean of the first 8 odd natural numbers is:
A dishonest shopkeeper promises to sell his goods at cost price. However, he uses a weight that actually weighs 49% less than what is written on it. Find his profit percentage.
The average weight of a family of five members (in kg) whose weights are 40 kg, 49 kg, 56 kg, 66 kg and 37 kg is:
A man covers the first half of the journey at the speed of 60 km/h and the remaining at the speed of 84 km/h. What is his average speed (in km/h)?
Find the simple interest (in ₹) on ₹3500 as a sum borrowed at 3% per year rate of interest for 2 years.
A water well has height h meters and diameter 21 m. The cost of plastering the well is ₹1,36,125 at the rate of ₹275/m?, then find the height of the well. (∏=22/7)
A person has to cover a distance of 8 km in 1 hour. If he covers one-fourth of the distance in one-third of the total time, then what should his speed (in km/h) be to cover the remaining distance in the remaining time so that the person reaches the destination exactly on time?
A closed cylindrical tank of height 280 cm and base radius 70 cm is to be made from a metal sheet. The required sheet for the same, in m², is: