Answer:
50
Step-by-step explanation:
let x = total DVD rentals
450=9x
450/9=x
50=x
50 DVDs were rented
<span>5t=3b+660....and ... 2t+5b=450
from the first we can see that t=(3b+660)/5 and using this value in the second...
(6b+1320)/5+5b=450 making all have common denominator..
6b+1320+25b=2250
31b=930
b=30...and since 2t+5b=450
t=150</span>
