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Averages: The Average Pie

What was the average production rate of cups of espresso per machine for Machines A, B, C, and D last week? >(1) Machines A and D produced a total of 503 cups of espresso last week. >(2) Machines B and E produced a total of 405 cups of espresso last week.
Correct.

[[snippet]]

Statement (1) only has the number of cups for machines A and D, so (1) Insufficient → BCE. Statement (2) has the number of cups for Machines B and E. E is not mentioned in the question stem as one of the machines we need the average for, and in any case, we don't know the total of the other machines when reading (2) alone. So (2) Insufficient → CE.

Combining both statements still does not yield the total number of espresso cups for the four Machines A, B, C, and D, so (1)+(2) Insufficient → E.
Incorrect. [[snippet]] Statement (1) only has the number of cups for Machines A and D, so (1) Insufficient → BCE.
Incorrect. [[snippet]] Statement (2) tells us nothing but the number of cups for Machines B and E (and where did Machine E come from?), so (2) Insufficient → ACE.
Did you mistake Machine E for Machine C?