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A uniform iro...

Question

A uniform iron bar of length $7$ m weighs $22.4$ kg. How much does the same bar of length $13$ m weigh?

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Solution

$\begin{matrix} 7 m l e n g h t o f u n i f o r m w e i g h t i s 22.4 k g \Rightarrow∴ 1 m l e n g h t o f u n i f o r m w e i g h t i s \frac{22.4}{7} T h e r e f o r \Rightarrow 13 m l e n g h t o f u n i f o r m w e i g h t i s = \frac{22.4}{7} \times 13 = 41.6 k g \end{matrix}$

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