Copyright © University of Cambridge. All rights reserved.
'Weekly Problem 43 - 2006' printed from http://nrich.maths.org/
Baldrick can afford to buy either 6 parsnips and 7 turnips or else 8 parsnips and 4 turnips. Both options leave him with no change whatsoever. If, however he bought only his beloved turnips, how many could he afford?
If you liked this problem, here is an NRICH task
which challenges you to use similar mathematical ideas.