Step-by-step explanation:
The number of people to paint the bridge is inversely proportional to the number of hours it takes.
(If there are more people, it will take less time etc.)
9 people can paint the bridge in 5 hours.
=> 2 people can paint the bridge in 5 * (9/2) = 22.5 hours.
(-2)(-5)(-7)
(10)(-7)
-70
The product is -70
15 goes into 18 once with 3 remainder.
18/15-15/15=3/15=1/5
So the answer is: