Three-quarters 5746

Ondra found that three-quarters of a bag of washing powder was used up in their family in 12 weeks. How many more weeks will they last? How long does a whole bag of washing powder last?

Correct answer:

a =  4
b =  16

Step-by-step explanation:


3/4 b = 12
a = b - 12

3/4·b = 12
a = b - 12

3b = 48
a-b = -12

Pivot: Row 1 ↔ Row 2
a-b = -12
3b = 48


b = 48/3 = 16
a = -12+b = -12+16 = 4

a = 4
b = 16

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