Question
Mr Paul had 800 g of pepper at first. On Sunday, he used 390 g of pepper. On Monday, he bought some pepper and had 520 g in the end. How much did he buy on Monday?
4 m

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Mr Paul had 800 g of pepper at first. On Sunday, he used 390 g of pepper. On Monday, he bought some pepper and had 520 g in the end. How much did he buy on Monday?