One hundred students were surveyed about whether they prefer snapchat or instagram. out of the 50 boys surveyed there were 40 boys who preferred instagram. out of the 50 there were 30 girls who preferred snapchat. assuming that all students have a preference how many girls preferred instagram?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?