Which problems can be solved by performing this multiplication?

15×30

select each correct answer.

there were 30 people in a room. one-fifth of the people had blue eyes. how many people had blue eyes?

jada had 30 crayons. she lost 15 of the crayons. how many crayons does she have left?

amelie read 30 pages of a book. she read 15 of the pages on monday. how many pages did she read on monday?

evan's mother drove 30 miles on wednesday and another 15 mile on wednesday. how many miles did she drive in all?