Three fruits

Quince, quonce and quance are three types of fruit. Can you work out the order of heaviness of the fruits?
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Problem



Quince, quonce, and quance are three types of fruit.

7 quince weigh the same as 4 quance.

5 quance weigh the same as 6 quonce.

          

Put the fruit into order of weight, heaviest last.

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If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.