we know that 18 students is 75% of the class and we need to know 100% of the class. to calculate this, divide the 18 students by 75% to work out what 1% of the students equals:
18 ÷ 75 = 0.24
0.24 students = 1% of the class. multiply this number by 100 to calculate 100% of the class:
Answer The formula for this question is: Number of the students of boys in percent times number of the student of girls over 100% equals to the number of boys in class so:X is the number of girls in percent 75%X=18 Before we criss-cross we simplify —— We can simplify 75 & 100 by 25 100% And also we cancel % by %
3X=18 Now we criss-cross — 4 3X=18x4 3X=72 Now we divide both sides by 3 — — 3 3 X=24 The answer is C
