Asixth grader weighs 90 pounds, which is 120% of what he weighed in fourth grade. how much did he weigh in fourth grade?

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Which of the following expressions are equivalent ?

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year