Respuesta :

Answer:

3.75

Step-by-step explanation:

Set up the following ratio:

2400 watt-hours           1 day

-------------------------   =    ----------

9000 watt-hours           x days

Then do criss-cross-apple-sauce:

x*2400=9000*1

And then solve for x:

2400x=9000

x=9000/2400

x=3.75