please answer this and show the work:forty percent of the thirty students in the class are boys.?

Question

how many girls are there?

Answer 1

40% of 30 students are boy

of means to multiply

so instead of saying 40% of studends are boy, we say:
40% mulitply to 30 are boy

40% = 40/100 = .4

.4 x 30 = 12

so there are 12 boys

Answer 2

Since 40% of students are boys out of a class of 30

simply calculate your percentages out of 100 * 30 students

40 / 100 * 30 (students) = 12 boys
that leaves a percentage of 60% for the girls

so 60 / 100 * 30 (students) = 18girls

so 12 + 18 = 30 students


Thanks
l1khs

Answer 3

If forty percent of the class are boys, then sixty percent of the class are girls (100% - 40% = 60%).

60% = 60/100 = 6/10

The class has 30 students.

6/10 * 30 = 180 / 10 = 18 students are girls

Simple as that

Answer 4

50% of the 30 students would equal 15.
but you have to do is multiple
30 students X 40%= 12 students are boys, 18 are girls

Answer 5

Since 40% are boys then 60% are girls.

Set it up. 30 students * .60 = 18 of the students are girls

Answer 6

12 boys 18 girls. you can do a ratio like 40/100 times blank over 30. multiply 30 and 40 and divide by 100 and youll get 12. then subtract 12 from 30 and youll get 18 girls.

Answer 7

30*40/100=12 boys

30-12=18 girls


or
%100-%40=%60 girls
30*60/100=18 girls.

Answer 8

30 * .4 = 12 boys
30 - 12 = 18 girls

Answer 9

n = boys


40% n 40 * 30 = 1200
----- = ----- 1200 / 100 = 12 12 boys
100 30whole class

30 - 12 =18 answer: 18 girls

Answer 10

"of" mathematically represents * or multiplication.so "40% of" is simply (40/100)*number of students in class.which is 40%*30=12.but these are the boys.so the girls are 30-12=18.