At Jerri’s Pet Shop, 60 cups of bird seed are used every 5 days to feed 20 parakeets. How many cups of bird seed would be required to feed 10 parakeets for 5 days?
Select
A) 45.6  B) 20  C) 9  D) 30  E) 65
Let's go step-by-step.   60 cups are used over a 5 day period, which means 12 cups a day. This feeds 20 parakeets, which means each parakeet needs .60 of a cup every day.   For 10 parakeets, we need 10*.60= 
<gadget id="calculator">10*.60</gadget>
<output>6</output>
6 cups a day. Over 5 days, we need 30 cups. Choice 30.
<result>D</result>
At Jerri’s Pet Shop, 60 cups of bird seed are used every 5 days to feed 20 parakeets. How many cups of bird seed would be required to feed 10 parakeets for 5 days?