Three days

During the three days, sold in stationery 1490 workbooks. The first day sold workbooks more than the third day. On the second day, 190 workbooks sold in less than the third day. How many workbooks are sold each day?

Correct answer:

x =  600
y =  350
z =  540

Step-by-step explanation:


x+y+z=1490
x = 60+z
y = z-190

x+y+z = 1490
x-z = 60
y-z = -190

Row 2 - Row 1 → Row 2
x+y+z = 1490
-y-2z = -1430
y-z = -190

Row 3 + Row 2 → Row 3
x+y+z = 1490
-y-2z = -1430
-3z = -1620


z = -1620/-3 = 540
y = -1430+2z/-1 = -1430+2 · 540/-1 = 350
x = 1490-y-z = 1490-350-540 = 600

x = 600
y = 350
z = 540

Our linear equations calculator calculates it.



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