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Ratio and Proportion

If d varies...

Question

If $d$ varies directly as $t$ , and if $d = 4$ when $t = 9$ , find $d$ when $t = 21$ .

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Solution

If $t = 9$ , them, $d = 4$
then $t = 21, d = \frac{4}{9} \times 21$
$∴ d = \frac{28}{3}$

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