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An elevator at a construction site has a maximum capacity of 1,400 kg. If the elevator operator weighs 80 kg
and each cement bag weighs 40 kg, how many bags of cement can safely lifted on the elevator in one trip?
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You need to solve an inequality
80 + n*40 <= 1400
and find the maximal integer value of n, which is the number of cement bags.
The solution is
n <= = 33.
Answer. 33 cement bags.