Weekly Problem 43 - 2006

Challenge Level: Challenge Level:1

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.