In the dairy

There were three times more packages of milk in the dairy than half a liter. When sold 10 liter and ten half-liter containers, four times more liters remained than 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

a = 210
b = 70

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