29th April 2005 at 01:00
Puzzles to test mathematical skills, set by Anita Straker. Solutions below

More brainteasers on


The fossil of an argentinosaurus is 37 metres long.

Its tail is twice as long as its neck, and its body is 2 metres longer than half its neck.

How long are the neck, body and tail of the fossil of the argentinosaurus?


In 2001, Ben's dad was four times as old as Ben.

In 2005, his dad will be three times as old as Ben.

In what year will Ben's dad be twice as old as Ben?

SOLUTIONS Prehistoric monster (ages 7 to 11) 10 metres, 7 metres and 20 metres. Ages and ages (ages 11 to 14) 2017. Assume Ben was x years old in 2001, so his father was 4x in 2001. In 2005, Ben will be x + 4 , and his dad will be 4x + 4. So 3(x + 44x + 4, giving x = 8. Assume that Ben's dad will be twice as old as Ben in y years from 2001. 2(8 + y32 + y, so y = 16. Ben's dad will be twice as old as Ben in 2017.

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