In Problem 10, If in the Same Amount of Time

In Problem 10, if in the same amount of time that it takes her to read 40 pages of economics and 30 pages of sociology, Martha could read 20 pages of economics and 110 pages of sociology, then which of these equations describes combinations of pages of economics, E, and sociology, S, that she could read in the time it takes to read 40 pages of economics and 30 pages of sociology?

A) E + S = 130.
B) + S = 50.
C) E + S = 70.
D) 4E + S = 190.
E) All of the above.

Correct Answer:

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