If the rate of the boat in still water is 20 mph, and the rate is x mph, what is the rate of the boat going upstream

If u good at math hit me up on insta or sum @basic_jaiden or @ and

Oliver read for 450 minutes this month his goal was to read for 10% more minutes next month if all of her medicine go how many minutes will you read all during the next two months

Julia bought 7 hats a week later half of all her hats were destroyed in a fire. there are now only 12 hats left with how many did she start