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Primary 6 - Model Sums

The total weight of Aaron, Bob and Carl is 131kg.
Aaron is 18kg lighter than Carl.
Bob is 7kg lighter than Carl.
​

What is Aaron's weight?

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Charles has twice as many stickers as Dan.
Adam has three times as many stickers as Charles.
If they have 72 stickers altogether,
​

How many stickers does Charles have?


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