Question
Mr Bryan had 600 g of flour at first. On Friday, he used 220 g of flour. On Saturday, he bought some flour and had 550 g in the end. How much did he buy on Saturday?
4 m

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Mr Bryan had 600 g of flour at first. On Friday, he used 220 g of flour. On Saturday, he bought some flour and had 550 g in the end. How much did he buy on Saturday?