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Puzzle ZWBR 


At my local farmer's merchant, you can buy chicken feed for £4 per tonne, pig feed for £3 per tonne, and cattle feed for 40p per tonne. The feed can only be purchased by the tonne, and part tonnes aren't sold.

Last week I bought some animal feed, and luckily I managed to buy exactly 100 tonnes for exactly £100. How much of each feed did I buy?

Puzzle Copyright © Kevin Stone

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What must the number of tonnes of cattle feed be a multiple of?


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