Bottles

Mrs. Violet brewed 15 l of raspberry juice. She poured it into 17 bottles. Some were 3/4 liter and some one liter. How many was bottles of this two types?

Correct result:

a =  8
b =  9

Solution:

a+b = 17
3/4 a + 1b = 15

a+b = 17
3/4•a + 1•b = 15

a+b = 17
3a+4b = 60

a = 8
b = 9

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