Seamstress

The seamstress bought two kinds of textile together 25 meters. One at 50 SKK and the second at 70 SKK per meter. How many meters were purchased from these two textiles when paid 1540 SKK?

Correct answer:

x =  10.5 m
y =  14.5 m

Step-by-step explanation:


50 x + 70 y = 1540
x+y = 25

50·x + 70·y = 1540
x+y = 25

50x+70y = 1540
x+y = 25

Row 2 - 1/50 · Row 1 → Row 2
50x+70y = 1540
-0.4y = -5.8


y = -5.8/-0.4 = 14.5
x = 1540-70y/50 = 1540-70 · 14.5/50 = 10.5

x = 21/2 = 10.5
y = 29/2 = 14.5

Our linear equations calculator calculates it.



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