Answer:
30lbs of recyclables.
Explanation:
-Let x be the corresponding lbs of recyclables to 40lbs of trash.
-Given that for every 100lb of trash, 75lb is recyclable.
-We determine the ratio of trash to recyclables and use it to calculate the amount correspond to 40lbs of trash:

Hence, thee are 30lbs of recyclables in 40lbs of trash.