Question

What is $ \dfrac{5}{8} $ of 10 litres?

Answer 1

Hint: We first try to multiply $ \dfrac{5}{8} $ to 10. We use the G.C.D of the denominator and the numerator to divide both of them to find the simplified form. We get the simplified form when the G.C.D is 1.

Complete step by step solution:
The value of $ \dfrac{5}{8} $ of 10 litres is $ \dfrac{5}{8}\times 10=\dfrac{50}{8} $ .
Simplified form is achieved when the G.C.D of the denominator and the numerator is 1.
This means we can’t eliminate any more common root from them other than 1.
For any fraction $ \dfrac{p}{q} $ , we first find the G.C.D of the denominator and the numerator. If it’s 1 then it’s already in its simplified form and if the G.C.D of the denominator and the numerator is any other number d then we need to divide the denominator and the numerator with d and get the simplified fraction form as $ \dfrac{{}^{p}/{}_{d}}{{}^{q}/{}_{d}} $ .
For our given fraction $ \dfrac{50}{8} $ , the G.C.D of the denominator and the numerator is 2.
 $ \begin{align}
  & 2\left| \!{\underline {\,
  8,50 \,}} \right. \\
 & 1\left| \!{\underline {\,
  4,25 \,}} \right. \\
\end{align} $
Now we divide both the denominator and the numerator with 2 and get $ \dfrac{{}^{50}/{}_{2}}{{}^{8}/{}_{2}}=\dfrac{25}{4} $ .
Therefore, the $ \dfrac{5}{8} $ of 10 litres is $ \dfrac{25}{4} $ litres.
So, the correct answer is “ $ \dfrac{25}{4} $ litres”.

Note: The process is similar for both proper and improper fractions. In case of mixed fractions, we need to convert it into an improper fraction and then apply the case. Also, we can only apply the process on the proper fraction part of a mixed fraction. The decimal form would have been $ \dfrac{25}{4}=6.25 $ litres.