The water barrel

The water barrel weighs 122 kg. If we pour 75% of the water out of it, it will weigh 35 kg. What is the weight of the barrel?

Final Answer:

s =  6 kg

Step-by-step explanation:


s+v=122
s + v -0.75 v = 35

s+v=122
s + v -0.75·v = 35

s+v = 122
s+0.25v = 35

Row 2 - Row 1 → Row 2
s+v = 122
-0.75v = -87


v = -87/-0.75 = 116
s = 122-v = 122-116 = 6

s = 6
v = 116

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You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem

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