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Please help me to find 7th question

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let \: the \: edge \: of \: first \: cube \: be \: a \: cm \: \\ now \: according \: to \: the \: question \: \\ 6 {a}^{2} = 6 ({3}^{2} ) + 6( {4}^{2}) + 6 ({12}^{2} ) \: \:  \: \: \: \: \: \: \: (since \: the \: surface \: area \: of \: cube \: = 6( {edge}^{3} )) \\ 6 {a }^{2} = 54 + 96 + 864 \\ 6 {a}^{2} = 1014 \\ {a}^{2} = \frac{1014}{6} \\ {a}^{2} = 169 \\ a = 13 \: cm \: \\ \\ so \: the \: side \: of \: first \: cube \: = 13 \: cm


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