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not understanding how to calculate day wise how much she bought. . Find the number of masks bought and sold by Veena on December 13. Veena buys masks every day from a tailor and sells all the masks to the resellers the same day. From December 1 to December 13, the details of masks bought and sold by Veena is as follows:   Date -December 1 to 4 - Number of masks bought and sold- 320 Date -December 1 to 5 - Number of masks bought and sold- 376 Date -December 1 to 6 - Number of masks bought and sold- 440 Date -December 1 to 7 - Number of masks bought and sold- 522Date -December 2 to 8 - Number of masks bought and sold- 524Date -December 3 to 9 - Number of masks bought and sold- 530Date -December 4 to 10 - Number of masks bought and sold-500Date -December 5 to 11 - Number of masks bought and sold- 474Date -December 6 to 12 - Number of masks bought and sold- 478Date -December 7 to 13 - Number of masks bought and sold- 480

not understanding how to calculate day wise how much she bought. . Find the number of masks bought and sold by Veena on December 13. Veena buys masks every day from a tailor and sells all the masks to the resellers the same day. From December 1 to December 13, the details of masks bought and sold by Veena is as follows:   Date -December 1 to 4 - Number of masks bought and sold- 320 Date -December 1 to 5 - Number of masks bought and sold- 376 Date -December 1 to 6 - Number of masks bought and sold- 440 Date -December 1 to 7 - Number of masks bought and sold- 522Date -December 2 to 8 - Number of masks bought and sold- 524Date -December 3 to 9 - Number of masks bought and sold- 530Date -December 4 to 10 - Number of masks bought and sold-500Date -December 5 to 11 - Number of masks bought and sold- 474Date -December 6 to 12 - Number of masks bought and sold- 478Date -December 7 to 13 - Number of masks bought and sold- 480