Question

42% of what number is 0.21

Answer 1

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Answer 2

$\underline{\mathsf{ Solution : }}$

$\mathsf{ Let \: the \: number \: is \: \bold{x}}. \\ \\ \mathsf{ According \: to \: question : } \: \\ \\ \mathsf{ \implies 42 \: \% \: of \: x \: = \: 0.21} \\ \\ \mathsf{ \implies \dfrac{42}{100} \: x \: = \: \dfrac{21}{100} } \\ \\ \mathsf{ \implies x \: = \: \dfrac{21}{100} \: \div \: \dfrac{42}{100} } \\ \\ \mathsf{ \implies x \: = \: \dfrac{21}{ \cancel{100}} \: \times \: \dfrac{ \cancel{100}}{42} } \\ \\ \mathsf{ \implies x \: = \: \dfrac{1}{2} } \\ \\ \mathsf{ \therefore \: \: x \: = \: 0.5 \: }$

$\boxed{\underline{\mathsf{ Hence, \: the \: number \: is \: 0.5 .}}}$