Question

please answer with detail..
At a certain small town, p gallons of gasoline are needed per month for each car in town. At this rate, if there are r cars in town, how long, in months, will q gallons last?
(a) pq/r
(b) qr/p
(c) r/pq
(d) q/pr
(e) pqr

Answer 1

if there are p gallons and r cars in the town, then in a month;
p.r galons will be required.
if 1 month=p.r gallons
therefore ? months=q gallons
1xq/pr
=(d) q/pr

Answer 2

thanks alot

Answer 3

welcome my dear