Quince, quonce, and quance are three types of fruit. Seven quince weigh the same as four quonce, and five quonce weigh the same as six quance.
Put the fruit into order of weight, heaviest last.
Click here for a poster of this problem.
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.