The RRB Group D Results are expected to be out soon! The Railway Recruitment Board released the RRB Group D Answer Key on 14th October 2022. The candidates will be able to raise objections from 15th to 19th October 2022. The exam was conducted from 17th August to 11th October 2022. The RRB (Railway Recruitment Board) is conducting the RRB Group D exam to recruit various posts of Track Maintainer, Helper/Assistant in various technical departments like Electrical, Mechanical, S&T, etc. The selection process for these posts includes 4 phases- Computer Based Test Physical Efficiency Test, Document Verification, and Medical Test. Arithmetic is a branch of mathematics that deals with numerals, number system, and their operations from ancient times. The term was originally derived from the Greek word “arithmos” which simply means numbers. It is preferred to get a definite single value. The traditional methods of arithmetic operations are constituent of addition, difference, multiplication, and division. These operations are being carried out for the purpose of human social and economical development for centuries. History of Arithmetic
Besides the traditional operations of addition, subtraction, multiplication, and division arithmetic also include advanced calculating methods for percentage, logarithm, exponentiation and square roots, etc. The four basic operations of arithmetic are discussed below- Addition (+) Addition or also known as summation is an operation to combine two or more values or numbers into a single value. The process of adding n number of values is called summation. 0 is considered as the identity element of addition as while adding 0 to any value gives the same result. For example, if we add 0 to 5 the result would be the same that is 5. 0 + 3 = 3 And, the addition of the opposite value of the same number is said to be an inverse element. The result of the addition of inverse elements is an identity element that is 0. For example, if we add 2 with its opposite value -5, then the result would be 5 + (-5) = 0 Subtraction (-) The arithmetic operation determines the difference between two values (i.e. minuend minus the subtrahend) is subtraction. In the cases, where the minuend is greater than the subtrahend, the difference is positive. It is the inverse of addition. 9 – 3 = 6 While, if the subtrahend is greater than minuend the difference between them will be negative. 3 – 9 = -6 Multiplication (×) Multiplication is the operation that combines the two values that is multiplicand and multiplier to give a single product. The two values involved in the operation of multiplication are known as multiplicand and multiplier. The product of two values supposedly x and y are expressed in x.y or x×y form. Division (÷) The division is the operation that computes the quotient of two numbers. It is the inverse of multiplication. The two values involved in it are known as dividends by the divisor and if the quotient is more than 1 if the dividend is greater than the divisor the result would be a positive number. 10/5 = 2 Sum of two numbers is 40 and their difference is 10. Find the numbersAnswer:
Question 1: The sum of two numbers is 8 and their difference is 4. Find the variables. Answer:
Question 2: If the sum of two numbers is 95 and one exceeds the other by 15. What are the numbers? Answer:
Question 3: The sum of the two numbers is 25 and the difference is 13. Find the numbers. Answer:
Question 4: If the sum of two non-zero numbers is 8 and their difference is 7. Find the value of numbers. Answer:
The Sum of Two Numbers is 40 and Their Difference is 10 x + y = 40 The difference between x and y is 10. In other words, x minus y equals 10 and can be written as equation B:x - y = 10 Now solve equation B for x to get the revised equation B: x - y = 10 x + y = 40 y = 15 Now we know y is 15. Which means that we can substitute y for 15 in equation A and solve for x: x + y = 40 Sum: 25 + 15 = 40 Sum Difference Calculator Do you want the answer to a similar problem? Enter the sum and difference here to find the two numbers: The Sum of Two Numbers is 40 and Their Difference is 11 Shatiek S. 2 Answers By Expert Tutors Let's break the problem into two parts. Your looking for two numbers that work for both parts of the sentence. 1) "The sum of two numbers is 40." The word "sum" mean to add. For this part of the problem, you'd need to think of ways to get two numbers that add up to 40. For instance, 20 + 20 = 40. Another solution would be 35 + 5 = 40, and so on. 2) Let's look at the second part of the problem. "Their difference is 10." The word "difference" mean to subtract. For this part of the problem you would need to think of two numbers whose difference is 10. for instance, 20 - 10 = 10, Another possibility is 52 - 42 = 10. Since we are looking for two number that work with BOTH parts of the question, the correct answer is 25 and 15. Why are these the two correct numbers? There you go! Best wishes!
Barakah Q. answered • 06/05/19 Wellesley College Computer Sci & Pol Sci, 7+ Years Tutoring
We know that x + y = 40 and x - y = 10. Since we have two equations with these values, we need to do substitution. We know that x = 40 - y. We use this x value that we have an plug it into the other equation. Thus x - y = 10 is the same as (40 - y) - y = 10. This is equal to 40 - 2y = 10. We then move around the numbers in the equation to get 2y = 30. You want to isolate the y value, so you divide by 2 and get y = 15. Now you know the value of y and you can plug it in to get the value of x. Thus x - 15 = 10, thus x = 25. |