Explain! Prizes! Thank you !

$16

Step-by-step explanation:

20/5 = 4

4 x 4 = 16

Have a good day!

Work Shown:

5 notebooks = 20 dollars

5/5 notebooks = 20/5 dollars divide both sides by 5

1 notebook = 4 dollars unit rate

4*(1 notebook) = 4*(4 dollars) multiply both sides by 4

4 notebooks = 16 dollars

Another approach:

(5 notebooks)/(20 dollars) = (4 notebooks)/(x dollars)

5/20 = 4/x

5*x = 20*4 ... cross multiply

5x = 80

5x/5 = 80/5 dividing both sides by 5

x = 16

So 4 notebooks cost $16