Question 341621
The kitten and the bunny weighted 7 pounds.
The kitten and the puppy weighted 8 pounds.
The bubby and the puppy weighed 9 pounds. 
What is the weight of the puppy?
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Equations:
k + b = 7
k + p = 8
b + p = 9
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Rearrange:
K + b +0 = 7
k + 0 +p = 8
0 + b +p = 9
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Solve with any method you know to get:
k = 3
b = 4
p = 5
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Cheers,
Stan H.
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A. 2 pounds B. 3 pounds C. 4 pounds D. 5 pounds E. 6 pounds