Ten skeins of yarn will make 4 scarves. how many scarves can be made with 25 skeins of yarn?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?