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Question

What percent of 84 is 21?


Solution

Answer 
$$25 \%$$
Explanation ;
Do 
$$\dfrac{100 \%}{x \%} = \dfrac{84}{21}$$
Solve for x
$$\left ( \dfrac{100}{x} \right ) \times x = \left ( \dfrac{84}{21} \right ) \times x $$ [multiply both sides of the equation by x]
$$ 100 = 4 x $$ [divided both sides of the equation by 4 to get x ]
$$\dfrac{100}{4} = \dfrac{4x}{4} $$
$$25 = x $$
25 percent of 84 is 21.

Mathematics

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