Mathematics, 14.12.2021 16:50 teagan1716
9. A student obtains marks in mathematics, physics, and biology. The average of his mathematics and physics marks is 15, his average mark for mathematics and biology is 17, and his average mark for physics and biology is 23. If so, what mark does the student obtain from biology?
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9. A student obtains marks in mathematics, physics, and biology. The average of his mathematics and...
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