(Answered) This weekend martha has time to read 40pages of economics

Economics

This weekend, Martha has time to read 40pages of economics and 30pages of sociology. Alternatively, she could read 10pages of economics and 90pages of sociology. Which of these equations describes all combinations of pages of economics, E, and sociology, S, that she could read over the weekend?

a. E/2 +S = 50.

b. E +S = 100.

c. E +S = 70.

d. 2E +S = 110.

e. All of the above.

Can someone please explain how to reach the answer?

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