Buttons

The men's shirt has sewn nine buttons, and the blouse has three buttons. Together they sewed 60 pieces and consumed 390 buttons. How many shirts?

Correct answer:

k =  35

Step-by-step explanation:


60=k+h
390= 9k+3h

60=k+h
390= 9·k+3·h

h+k = 60
3h+9k = 390

Pivot: Row 1 ↔ Row 2
3h+9k = 390
h+k = 60

Row 2 - 1/3 · Row 1 → Row 2
3h+9k = 390
-2k = -70


k = -70/-2 = 35
h = 390-9k/3 = 390-9 · 35/3 = 25

h = 25
k = 35

Our linear equations calculator calculates it.



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