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This is a Quantity Each Product and Before After question .

LCM (left)

1/3 = 6/18

3/4 

  Before   Transfer After  
Pen 18u -12 6u
Notebook 4u -1u 3u
Total 22u    

a)

22u = 550

1u = 550 ÷ 22 = 25

18u = 18 × 25 = 450 pens

b)

    Quantity  Each Product
Pen 450 1u + 0.3 450u + 135
Notebook  100 1u 100u
Total 550    

450u + 135 = 100u + 660 

450u – 100u = 660 – 135

350u = 525

1u = 525 ÷ 350 = $1.5

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