Olaf has 250 files on an external hard drive of those files 12% are photos.(a)write a percent proportion to find the number of files that are phots.(b) how many phots does olaf have saved on his external hard drive?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?