How many panels did Plant B produce, if the two plants together produced 1260 defective panels?

Question

plan a produced 3 times as many panels as plan b  Four percent of the panels from Plant A and 2%
of the panels from Plant B were defective 

Answer 1

Let X = panels produced by plant B

Let 3X = panels produced by plant A

4% of plant A panels and 2% of plant B panels were defective

(.04)( 3X) + .02X = 1260

.12X + .02X = 1260

.14X = 1260

X = 9000

plant B produced 9,000 panels,    plant A produced 27,000 panels