Question 269068
The price P for a watermelon varies directly with its
weight w.
a) Write a formula for this variation.
P = kw
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b) If the price of a 30-pound watermelon is $4.20, 
Use that fact to find "k":
4.2 = k(30)
k = 4.2/30
k = 2.1/15
k = 0.7/5
k = 7/50
So the Equation is P = (7/50)w
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then what is the price of a 20-pound watermelon?
P = (7/50)(20)
P = 14/5
Price = $2.80
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Cheers,
Stan H.