Step-by-step explanation:
[tex] \underline{ \text{Let \: the \: required \: number \: be \: x}} : [/tex]
[tex] \text{According \: to \: question \: (ATQ)} : [/tex]
⟼ [tex] \tt{ \frac{1}{3} \times x = 7}[/tex]
⟼ [tex] \tt{ \frac{1 \times x}{3} = 7}[/tex]
⟼ [tex] \tt{ \frac{x}{3} = 7}[/tex]
Apply cross product property :
⟼ [tex] \boxed{ \sf{x = 27}}[/tex]
[tex] \pink{ \boxed{ \boxed{ \tt{Our \: final \: answer : \underline{ \tt{x = 27}}}}}}[/tex]
Hope I helped ! ♡
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