Bottles 31621

We filled 90 liters of must into bottles. Some have a volume of 1 liter, and some with a volume of 1.5 liters. We have a total of 70 bottles of must. How many bottles of each species did we fill?

Correct answer:

a =  30
b =  40

Step-by-step explanation:


a+b=70
1a+1.5b=90

a+b=70
1·a+1.5·b=90

a+b = 70
a+1.5b = 90

Row 2 - Row 1 → Row 2
a+b = 70
0.5b = 20


b = 20/0.5 = 40
a = 70-b = 70-40 = 30

a = 30
b = 40

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