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

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?

Anyone know these questions? i need ,.