Jonathan’s class has 30 boys. of the students in his class, 60% are girls. how many girls are in jonathan’s class?

45 girls

Step-by-step explanation:

RemarkThere are only 2 choices for gender. So if the class is 60% girls, the there must be 100 - 60 = 40% for the boys. But we are told that the boys are 30 in number.Let x = the total number of students.

Solution

40/100 * x = 30              Change the % to a decimal0.4 x = 30                       Divide both sides by 0.40.4 x / 0.4 = 30 / 0.4      Do the divisionx = 30/0.4x = 75 students in total

Formula

Total of Boys and Girls = Number of boys + number of girls.

Givens

Total = 75Number of boys = 30

Solution II

75 = x + 30                 Subtract 30 from each side75 - 30 = x +30 - 3045 = xThere are 45 girls in the class.