Afternoon 3523

There were 120 vehicles in the parking lot during the afternoon. CZK 20 for a car and CZK 50 for a bus. The security guard collected a total of 2,640 CZK for parking. How many cars and how many buses were parked in the parking lot

Correct answer:

a =  112
b =  8

Step-by-step explanation:


a+b=120
20a+50b= 2640

a+b=120
20·a+50·b= 2640

a+b = 120
20a+50b = 2640

Pivot: Row 1 ↔ Row 2
20a+50b = 2640
a+b = 120

Row 2 - 1/20 · Row 1 → Row 2
20a+50b = 2640
-1.5b = -12


b = -12/-1.5 = 8
a = 2640-50b/20 = 2640-50 · 8/20 = 112

a = 112
b = 8

Our linear equations calculator calculates it.



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