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5 : 20
Divide both sides by 5 to get the answer
5/5 = 1
20/5 = 4
Thus, the answer is 1 : 4
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Answer:
the answer is probably inverse or joint or combined,really haven't seen this type of variation before

As, 

=0.301029+0.845098+1.13943
=2.26007
=2.260(approximate)
The answer to the problem is
y=1/2x
the answer is D. all of the above