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A printer and a copier each work at their own constant rate. Together, how many pages do they produce in one minute?
(1) The printer produces 12 pages per minute.
(2) The copier produces 18 pages per minute.
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Correct answer
C
When two machines work together their rates add, so the combined output is the sum of the two per-minute rates.
Statement (1): printer 12 pages per minute, but the copier rate is unknown. Not sufficient.
Statement (2): copier 18 pages per minute, but the printer rate is unknown. Not sufficient.
Together: 12 + 18 = 30 pages per minute. Unique. Neither alone.
The (A)/(B) lure supplies one of the two rates whose sum is the answer; both are required.
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