In the dairy

There were three times more milk packages in the dairy than half a liter. Four times more liters remained when sold in 10 liters and ten half-liter containers than in half-liter packages. How many packages were there originally?

Correct answer:

a =  210
b =  70

Step-by-step explanation:

a-10 = 4·(b-20)

a-10 = 4·(b-20)

a-3b = 0
a-4b = -70

Row 2 - Row 1 → Row 2
a-3b = 0
-b = -70

b = -70/-1 = 70
a = 0+3b = 0+3 · 70 = 210

a = 210
b = 70

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