Question 1196657
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x = number of panels from plant B
x-6000 = number of panels from plant A


3% of (x-6000) = 0.03(x-6000) = number of defective panels from plant A
4% of x = 0.04x = number of defective panels from plant B


0.03(x-6000)+0.04x = total number of defective panels
0.03(x-6000)+0.04x = 800
0.03x-180+0.04x = 800
0.07x-180 = 800
0.07x = 800+180
0.07x = 980
x = 980/0.07
x = <font color=red>14000</font> panels from plant B
x-6000 = 14000 - 6000 = 8000 panels from plant A


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Check:
3% of A = 0.03*8000 = 240 defective panels from A
4% of B = 0.04*14000 = 560 defective panels from B
240+560 = 800 defective panels total
The answer is confirmed.
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Answer: <font color=red>14000 panels</font> were produced by plant B.
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