18th March 2005 at 00:00
Mr and Mrs Brown

When Mr and Mrs Brown married, the sum of their ages was 44.

The difference between their ages was one-sixth of the sum of their ages 10 years before their marriage.

How old were Mr and Mrs Brown when they married?


The integers from 1 to 9 are listed on a blackboard.

The mean of all the numbers in the list is 5.

Some extra eights and nines are added to the list.

The mean of all the numbers on the list is now 7.3.

How many eights and nines are added to the list?

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