Lizzy working alone can do 3 jobs in q hours, and michaelworking alone can do 4 jobs in r hours. how long will it take lizzy and michael to do 3 jobs if they work together?

just give me formula but make it clear

2nd one in the first row is correct

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.