Question

laura works at a local supermarket. she can stack 7 shelves in 1\3 of an hour. At this rate, how many shelves can she stack in 2 hours

Answer 1

7 stacks in 1/3

so how many would she stack in an hour? just multiply 7 *3

if she stacks 21 in an hour, multiply by 2 to find 2 hours