This blog post provides a comprehensive overview of the top 30 questions for the Railway RPF SI exam, focusing on key mathematical concepts and problem-solving techniques. It covers various topics including percentages, profit and loss, geometry, and algebra, ensuring that students are well-prepared for their exams.
Welcome to the Super 30 series by Aditya Ranjan Sir, where we dive deep into the essential mathematical concepts needed for the Railway RPF SI exam. In this post, we will explore the top 30 questions that can help you revise and strengthen your understanding of key topics.
The Super 30 series aims to provide a thorough revision for every exam through carefully selected questions. This is the second video in the series, following the first one focused on RPF Constable preparation. We are excited to have reached a milestone of 300,000 subscribers, and we appreciate your support.
Problem: What is the value of ( \frac{2.13}{3.12} )?
To solve this, we need to understand how to handle repeating decimals. The repeating decimal ( 0.9 ) can be expressed as ( 1 ). Similarly, we can convert ( 2.13 ) and ( 3.12 ) into fractions and simplify.
Problem: Martin donates 13% of his salary to the blind, 12% to orphans, and 14% to animal welfare. If he saves 42,300 after these donations, how much does he donate to orphans?
To find the donation to orphans, we first calculate the total percentage donated and then determine the remaining percentage to find the total salary.
Problem: If an item is sold for a profit of 28% and another for a loss of 24%, what is the cost price?
Using the formula for profit and loss, we can set up equations based on the selling prices and solve for the cost price.
Problem: If an item is sold for 1,741 with a profit and for 897 with a loss, what is the cost price?
This question can be solved using the butterfly concept, which relates profit and loss to find the cost price.
Problem: An item is sold at a marked price with two successive discounts. If the marked price is 920 and the total discount is 31.2, what is the discount percentage?
We can use the formula for successive discounts to find the effective discount percentage.
Problem: If a sum of money gives a maturity amount of 5768 at a simple interest rate of 2% per annum, what is the principal amount?
Using the formula for simple interest, we can rearrange to find the principal amount.
Problem: If the average of seven numbers is 143, what is the number that can be removed to keep the average the same?
This involves understanding how averages work and how removing a number affects the overall average.
Problem: If two alloys are mixed in a certain ratio, what is the percentage of one component in the final mixture?
Using the concept of ratios and proportions, we can determine the percentage of the component in the mixture.
Problem: Given a square and a triangle, what is the distance between their centers?
This question requires knowledge of geometry and the properties of shapes.
Problem: If one person can complete a task in 4 hours and another can destroy it in 7 hours, how long will it take to complete the task?
This involves calculating the effective work done by both individuals.
The questions covered in this blog post are designed to help you prepare effectively for the Railway RPF SI exam. By practicing these problems and understanding the underlying concepts, you can enhance your mathematical skills and boost your confidence for the exam. Remember to keep revising and practicing regularly. Good luck!
