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Question 72

Fifteen metres of cord cost 11.25ataconstantpricepermetre.Howmanymetrescanbeboughtfor11.25 at a constant price per metre. How many metres can be bought for 20.25? Enter the number of metres.

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27

Explication

The cord costs 11.25dividedby15,or11.25 divided by 15, or 0.75 per metre, and 20.25dividedby20.25 divided by 0.75 is 27 metres. Adding the $9 price increase to 15 would happen to mix dollars and metres, so it is not a valid proportional calculation.

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Question 72: Fifteen metres of cord cost $11.25 at a constant price per… · Ratios and Proportions · Questena