What is this fraction?

Algebra Level 2

Consider a proper fraction such that the sum of the numerator and denominator is 14 and the difference between them is 8.

Find this proper fraction.

6 14 \frac{6}{14} 5 10 \frac{5}{10} 2 9 \frac{2}{9} 1 5 \frac{1}{5} 3 11 \frac{3}{11}

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2 solutions

Munem Shahriar
May 1, 2017

Suppose that the proper fraction is x y \dfrac{x}{y} ; x < y ; x < y

x + y = 14............................................................(1)

y - x = 8 ..............................................................(2)

(+)

2 y = 22 2y = 22

y = ⇒ y = 22 2 \dfrac{22}{2}

y = 11 y = 11

Place value of y y to get x x

x + 11 = 14 x + 11 = 14

x = 14 11 ⇒ x = 14 - 11

x = 3 x = 3

Therefore, 3 11 \dfrac{3}{11} is the proper fraction.

let the fraction be y x \dfrac{y}{x} , then

x + y = 14 x+y=14 (1)

x y = 8 x-y=8 (2)

adding the two equations gives

2 x = 22 2x=22

x = 11 x=11


y = x 8 = 11 8 = 3 y=x-8=11-8=3


The fraction is 3 11 \boxed{\dfrac{3}{11}} .

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