Phil has saved some money and is going to buy some dvds. the number n of dvds phil can buy is inversely proportional to the cost c of a dvd. if the cost of one dvd is $16, then he can buy 10. if the cost of one dvd is $20, then how many dvds can he buy?

He can buy 8 DVD's.

Step-by-step explanation:

Since, The number N of DVDs Phil can buy is inversely proportional to the cost C of a DVD.

Thus,

⇒  ------- (1)

Where k is the proportional constant.

And, According to the question,

If the cost of one DVD is $16, then he can buy 10 DVD,

That is, If C = $16 then N = 10

Put these value in equation (1),

⇒ k = 160

Thus, the relation between N( number of DVD's ) and C( Cost of DVD's ) is, ( By putting the value of k in equation (1) )

If C = $20,

⇒ = 8

Therefore, If the cost of one DVD is $20, he can buy 8 DVD's.

it has 4

step-by-step explanation:

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