TITLE: 7 Year old School question
QUESTION [7 upvotes]: My 7 year old son was given this question as a sort of bonus question and although I managed to solve it using some really awful simultaneous equations I can't help but think there is a simpler more intuitive way to solve it. Afterall, it was given to a 7 year old.
The question is this:

Amir, Brett and Carly share some money.
Amir gets a third of the money.
Carly gets 5 times the as much as Brett.
Carly gets £84 more than Amir
How much money does Brett get?

Is there a really simple way to solve this? Any help is much appreciated

REPLY [14 votes]: An attempt to solve it with simple words ...
Brett gets $1$ part.
Carly gets $5$ parts
Carly and Brett get $6$ parts.
As Amir gets one third of the total, it is not difficult to derive that Amir gets $3$ parts.
Carly gets $2$ parts more than Amir: therefore a part corresponds to $42$ pounds.