Question
The total mass of 6 puffs and 3 biscuits is 570 g. Each puff has a mass nine times as much as a biscuit. Find the mass of a biscuit.
4 m

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The total mass of 6 puffs and 3 biscuits is 570 g. Each puff has a mass nine times as much as a biscuit. Find the mass of a biscuit.