Answers

2015-10-13T12:52:17+08:00
Let x be the weight of the water and y be the weight of the jar. Then,
x + y = 10
1/2 x + y = 5 3/4

Transforming the first equation, it becomes
x = 10 - y

Substituting this to the second equation,
1/2 (10-y) + y = 5 3/4
10/2 - 1/2 y + y = 5 3/4
-1/2 y + y = 5 3/4 - 10/2
1/2 y = 5 3/4 - 5
1/2 y = 3/4
y = 6/4 or 1 1/2

Therefore, the weight of the jar is 1 1/2 pounds.


- D.E.


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