Explanation:
Same steps, different problem.
x - pounds of type A coffee for current month
y - pounds of type B coffee for current month
x+y=145
4.2x+5.3y=659.9
x+y=145 -> multiply both sides by 4.2
4.2x+4.2y=609
1.1y=50.9
Answer:
She used 49 of type B
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