Bottles

The must is sold in 5-liter and 2-liter bottles. Mr. Kucera bought a total of 216 liters in 60 bottles. How many liters did Mr. Kucera buy in five-liter bottles?

Correct answer:

a =  160 l

Step-by-step explanation:


a/5+b/2 = 60
a+b = 216

2a+5b = 600
a+b = 216

Row 2 - 1/2 · Row 1 → Row 2
2a+5b = 600
-1.5b = -84


b = -84/-1.5 = 56
a = 600-5b/2 = 600-5 · 56/2 = 160

a = 160
b = 56

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