26th May 2006 at 01:00
Puzzles to test mathematical skills, set by Anita Straker. Solutions below More brainteasers on

Letter sequences

1 Find the letters to replace the question marks in each sequence and they will make a word.

2 What are the next three words in this sequence?

two hundred and sixty eight, twenty three, eleven, six, three, II, II, II

Mary likes a mix of white and brown sugar in her coffee. She keeps a special jar for it. Each day she uses half the contents of the jar and each night she fills it up again.

She starts each week by filling the jar with white sugar. After that she tops up with brown and shakes the jar to mix the contents evenly.

After how many days willMary have had more brown sugar than white in her coffee?

Log-in as an existing print or digital subscriber

Forgotten your subscriber ID?


To access this content and the full TES archive, subscribe now.

View subscriber offers


Get TES online and delivered to your door – for less than the price of a coffee

Save 33% off the cover price with this great subscription offer. Every copy delivered to your door by first-class post, plus full access to TES online and the TES app for just £1.90 per week.
Subscribers also enjoy a range of fantastic offers and benefits worth over £270:

  • Discounts off TES Institute courses
  • Access over 200,000 articles in the TES online archive
  • Free Tastecard membership worth £79.99
  • Discounts with Zipcar,, Virgin Wines and other partners
Order your low-cost subscription today