Answer:
The answer is 1
Step-by-step explanation:
i) 
ii)
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iii)
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iv) 
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v)
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vi)
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vii)
viii)
ix)
x)
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Rise over run is y over x. 9/5 is 1.8 you have x=20 i plugged in all numbers and when i plugged in 36 i got 1.8 so im sure the answer is D)36
3.5 since its asking how many he has, he has 3.5 its not askint how many bags he needs or how much a bag holds