How old is Gran?Y5 and Y6 BRAINTEASER
Here is a brainteaser for you.
You need to use reasoning about number and calculation.
Challenge
A girl, her mother and her grandmother have a combined age of 90 years.
The mother is half the age of the grandmother.
The girl is one third the age of the mother.
How old is the grandmother?
The girl's father said, 'I am the average age of all of you.'
How can you work out his age quickly?
Post your answers to the Blog.
Try to include reasons why the information in each statement helps you, and how you can find out what calculations you need to do.
As a next step you could try to make up an example of your own. You must be careful to make sure that the problem is possible and that ages make sense.
1 comment:
Hi Mrs Davies
the girl is 1/3 the mother is 3/3 the gran is 6/3 add them up and you get 10/3 =90 divid 90 by 10 =9 the girl is 9,the mum is 27 and the gran is 54.
the dad is 90 divided by 3 = 30.
Daniel.c
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