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    Here's a GCSE question I saw in a 9-1 practice paper (I've changed it a bit). Any GCSE students want to give it a go?

    John has some toy bricks. He has 300 red bricks, 300 green bricks and 300 blue bricks. He uses some of the bricks to build a model house. The number of red, green and blue bricks he uses are in the ratio 3 : 1 : 2.

    When he has finished building the house, he has twice as many green bricks left as red bricks. How many blue bricks does John have left?

    (No trial and error)

    Moltenmo - a good one for you to try
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Updated: February 12, 2017

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