Respuesta :

Answer:

D

Step-by-step explanation:

Piano: 2 hours

Cello: 4 hours

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Actual practice on the piano = 5 hours.

Actual practice on the cello = x

2/4 = 5/x

Notice the piano hours are on the top of the fractions on both the left and the right. All proportions work that way.

Cross multiply

2x = 4* 5

2x = 20               Divide by 2

x = 10

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