Evaluate $20 %$ of $80$

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Solution

To calculate the percentage of a number, we need to use a different formula such as:
$P %$ of Number $= x$ , where $x$ is the required percentage.
If we remove the $%$ sign, then we need to express the above formulas as;
$\frac{P}{100} \times N u m b e r = x$ .
Percentage’ is obtained by multiplying $80$ by $20 %$ .
$20 % \times 80 = \frac{20}{100} \times 80 = \frac{1600}{100} = 16$
Hence, $20 %$ of $80$ is $16$ .

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Similar questions

\frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}}

\sqrt{5} = 2.236 and \sqrt{10} = 3.162

\begin{array}{rcl} \frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}} & = & \frac{15}{\sqrt{10} + 2 \sqrt{5} + 2 \sqrt{10} - \sqrt{5} - 4 \sqrt{5}} \\ = & \frac{15}{3 \sqrt{10} - 3 \sqrt{5}} = \frac{5}{\sqrt{10} - \sqrt{5}} \end{array}

Evaluate $\frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}}$ , it us given that $\sqrt{5} = 2.236$ and $\sqrt{10} = 3.162$

\frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}}

\sqrt{5} = 2.236

\sqrt{10} = 3.162

\frac{\sqrt{80}}{\sqrt{405}}

\frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}}

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