According to the meaning of the question: (1+12%) (x-3) = X.
Solution: x = 28.
It is verified that x=28 is the solution of the original equation.
A: It was originally planned to complete this project in 28 months.
2. Solution: Let the number of parts processed by a worker per hour be X, so now the number of parts that a worker can process per hour is (1+20%) X.
Because the time for each worker to process 2 10 parts is half an hour less than the original time for processing 2 10 parts.
2 10/x-2 10/( 1+20%)x = 0.5
Multiply both sides of the equation by x at the same time and you get
2 10-2 10/ 1.2 = 0.5x
x = 2×(2 10-2 10/ 1.2)
= 2×(2 10- 175)
=2×35
=70 (pieces)
(1+20%) x =1.2× 70 = 84 (pieces)
A: In the past, a worker processed 70 parts per hour, but now a worker can process 84 parts per hour.
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