# Brainteaser solutions from page 38

5th September 2003 at 01:00
Counting triangles

Counting the different triangles from the largest to the smallest there are 1 + 2 + 2 + 6 + 3 + 18 = 32 Mashed potatoes

They started with 40 each:

After 10 minutes, Jay's pile of unpeeled potatoes has reduced by 30, and Joy's pile by 10. If x is the number of potatoes that Jay has left to peel, then Joy has 3x potatoes still to peel. It follows that x + 30 = 3x + 10, since they started with the same number. Solving the equation gives x = 10, so that the number of potatoes that each had at the start was 40.

Not a subscriber? Find out more about our subscription offers.
Subscribe now
Existing subscriber?
Enter subscription number

## The guide by your side – ensuring you are always up to date with the latest in education.

Get Tes magazine online and delivered to your door. Stay up to date with the latest research, teacher innovation and insight, plus classroom tips and techniques with a Tes magazine subscription.
With a Tes magazine subscription you get exclusive access to our CPD library. Including our New Teachers’ special for NQTS, Ed Tech, How to Get a Job, Trip Planner, Ed Biz Special and all Tes back issues.

Subscribe now