Question
The total mass of 4 shortbreads and 2 puffs is 490 g. Each shortbread has a mass twice as much as a puff. Find the mass of a puff.
4 m

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The total mass of 4 shortbreads and 2 puffs is 490 g. Each shortbread has a mass twice as much as a puff. Find the mass of a puff.