20/2.5 = 8
So 8 movies can be shown in 20 hours.
16 gal... 480 mi
1 gal... 480/16 = 30 mi
9 gal.. 30*9 = 270 mi
Hi
7 = 14.70
15= X
so : X = 15*14.70 /7 = 31.5
15 liters of petrol cost 31.5
The exponent indicates how many times the number is used as a factor