Brainteasers

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

More brainteasers on www.tes.co.ukteacherbrainteasers

PREHISTORIC MONSTER

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?

AGES TO AGES

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.

Subscribe to get access to the content on this page.

If you are already a Tes/ Tes Scotland subscriber please log in with your username or email address to get full access to our back issues, CPD library and membership plus page.

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

Comments

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