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Two factory plants are making TV panels.
Yesterday, Plant A produced 7000 fewer panels than plant B did.
Five percent of the panels from plant A and 3% of the panels from plant B were defective.
How many of panels did plant B produce, if the two plants together produced 1010 defective panels.
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Let x = # of TV panel produced by plant B.
Then the number of TV panels produced by plant A is (x-7000).
From the problem's description, you have this equation
0.05(x-7000) + 0.03*x = 1010 defective panel.
Simplify and find x
0.05x - 350 + 0.03x = 1010
0.08x = 1010 + 350
0.08x = 1360
x = 1360/0.08 = 17000.
ANSWER. Plant B produced 17000 TV panels.
Solved.