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A quantity, its \(1 / 3\), and its \(1 / 4\), added together, become 2 . What is the quantity? (problem 32 of the Rhind Mathematical Papyrus)

Short Answer

Expert verified
Answer: \(\frac{24}{19}\)

Step by step solution

01

Create an equation

Let’s represent the unknown quantity as x, and we know that the \(1/3\) of x and \(1/4\) of x added together with x itself result in 2. So we can write this as an equation: \[ x + \frac{1}{3}x + \frac{1}{4}x = 2 \]
02

Find a common denominator

To work with the fractions, we will find a common denominator. In this case, the common denominator for 3 and 4 is 12. Multiply each term by 12 to eliminate the fractions: \[12(x) + 12 (\frac{1}{3}x) + 12 (\frac{1}{4}x) = 2 \cdot 12\]
03

Simplify the equation

Now, we can simplify the equation by performing the multiplications: \[ 12x + 4x + 3x = 24 \]
04

Combine like terms

Combine the x terms: \[ 19x = 24 \]
05

Solve for x

To find the value of x, divide both sides by 19: \[ x = \frac{24}{19} \] The unknown quantity, x, is equal to \(\frac{24}{19}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Rhind Mathematical Papyrus
The Rhind Mathematical Papyrus is an exceptional documentation of ancient Egyptian mathematics. Named after Alexander Henry Rhind, a Scottish antiquarian who purchased the papyrus in 1858, it is believed to have been written around 1550 BCE.

The papyrus is a compilation of math problems and solutions that provide insights into the mathematical understanding and practical applications used by the Egyptians. It contains arithmetic, algebraic, and geometric problems, making it akin to a modern-day textbook. Notably, it exhibits the Egyptians' prowess in handling fractions, particularly unit fractions, which are fractions with a numerator of 1 and a different denominator.

Understanding this historic document not only illuminates the history of mathematical development but also demonstrates the ancient origins of many mathematical practices still in use today. The exercise we explore, problem 32, reflects the type of algebraic reasoning contained within the papyrus.
Fractions in Mathematics
Fractions are a fundamental concept in mathematics, representing parts of whole numbers. They are composed of a numerator and a denominator. In ancient Egypt, particular emphasis was placed on unit fractions, which have a numerator of 1 and are used to represent other fractions in sums.

Today, fractions remain a cornerstone of mathematical education. Learning to work with them involves understanding how to perform operations such as addition, subtraction, multiplication, and division. To solve equations involving fractions, as demonstrated in the historical exercise from the Rhind Papyrus, we typically find a common denominator to simplify calculations. This practice, deeply rooted in ancient mathematics, is essential for handling complex mathematical operations in various fields of study.
Algebraic Problem Solving
Algebraic problem solving is the process of finding unknown variables within equations through a series of systematic steps. It's a fundamental aspect of algebra, a branch of mathematics that deals with symbols and the rules for manipulating these symbols.

To solve algebraic problems, one usually starts by defining a variable to represent the unknown quantity. Then, by following algebraic principles, such as combining like terms and balancing equations, the value of the variable can be isolated and calculated. As observed in the solution to the Rhind Papyrus problem, these steps still form the crux of algebraic problem-solving techniques used in contemporary mathematics education.

The clear and methodical approach to algebra helps students understand relationships between numbers and foster analytical thinking, which has applications beyond mathematics into fields such as science, engineering, and economics.

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Most popular questions from this chapter

. Solve the following problem from tablet YBC \(6967: \mathrm{A}\) number exceeds its reciprocal by \(7 .\) Find the number and the reciprocal. (In this case, that two numbers are "reciprocals" means that their product is \(60 .\) )

Show that the area of the Babylonian "barge" is given by \(A=(2 / 9) a^{2}\), where \(a\) is the length of the arc (one-quarter of the circumference). Also show that the length of the long transversal of the barge is \((17 / 18) a\) and the length of the short transversal is \((7 / 18) a\). (Use the Babylonian values of \(C^{2} / 12\) for the area of a circle and \(17 / 12\) for \(\sqrt{2}\).)

Solve the Babylonian problem taken from a tablet found at Susa: Let the width of a rectangle measure a quarter less than the length. Let 40 be the length of the diagonal. What are the length and width? Use false position, beginning with the assumption that 1 (or 60 ) is the length of the rectangle.

Problem 72 of the Rhind Mathematical Papyrus reads " 100 loaves of pesu 10 are exchanged for loaves of pesu 45 . How many of these loaves are there? The solution is given as, "Find the excess of 45 over \(10 .\) It is 35 . Divide this 35 by 10. You get \(3 \overline{2}\). Multiply \(3 \overline{2}\) by 100. Result: 350. Add 100 to this 350 . You get 450 . Say then that the exchange is 100 loaves of pesu 10 for 450 loaves of pesu \(45 . "^{18}\) Translate this solution into modern terminology. How does this solution demonstrate proportionality?

Convert the fractions \(7 / 5,13 / 15,11 / 24\), and \(33 / 50\) to sexagesimal notation. (Do not worry about initial zeros, since the product of a number with its reciprocal can be any power of \(60 .\) ) What is the condition on the integer \(n\) that ensures it is a regular sexagesimal, that is, that its reciprocal is a finite sexagesimal fraction?

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