Question
Mr Howard had 700 g of rice flour at first. On Thursday, he used 340 g of rice flour. On Friday, he bought some rice flour and had 580 g in the end. How much did he buy on Friday?
4 m

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Mr Howard had 700 g of rice flour at first. On Thursday, he used 340 g of rice flour. On Friday, he bought some rice flour and had 580 g in the end. How much did he buy on Friday?