16 pearls/20opals = 8pearls/ blank opals complete each equivalent ratio

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

Ineed to know the answer to this algebra question.

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)