R10a – Solving problems involving direct proportion

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An illustration of quantities in direct proportion

Adjust the dark grey slider to select the cost of 1 metre of rope. Now in this example, the cost of a piece of rope is directly proportional to its length. The longer the rope, the more it will cost. What happens to the cost if you double the length of rope? What if you triple the length? Investigate by adjusting the blue and green sliders.

Direct proportion in other contexts: currency conversions and imperial-metric conversions

Solving problems involving direct proportion

Links to past exam questions

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In the real world

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