Mathematics, 26.02.2021 19:30, choiboiqg6811

3.) Bob spent $780 on books. Math books cost $60 per book and science books cost $70. If he bought a total of 12, then how many of each did he buy?
math books:

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3.) Bob spent $780 on books. Math books cost $60 per book and science books cost $70. If he bought...