Question

Ind the cost of 7 pens; if 2 pens cost $ 18

Answer 1

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Find the cost of $7$ pens, if $2$ pens cost $ $18.$

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• $2$ pens cost $ $18.$

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The cost of $7$ pens.

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$2$ pens cost $ $18.$

$1$ pen costs $ $\frac{18}{2}$ = $ $9$.

$7$ pens cost $ $(9\times{7})$ = $ $63.$

OR

$2$ pens cost $ $18.$

Cost of $7$ pens

= $ $[(\frac{18}{2}) \times{7}]$

= $ $(9\times{7})$

= $ $63$

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Cost of $7$ pens = $ $63.$

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The cost of $7$ pens is $ $63.$

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