Problema Solution
in a school,out of 300 students. 70 % are girls and 30% are boys. if 30 girls leave and no new boy is admitted , what is the new percentage of girls in the school??
Answer provided by our tutors
70% of 300 are girls or 0.70*300 = 210 girl
30% of 300 are boys or the rest of the students: 0.30*300 = 90 bogs
30 girls leave and no new boy is admitted:
there are 210 - 30 = 180 girls now and 90 boys
the new percentage of girls is:
180/(300 - 30) = 0.6667 or 66.67% girls.