In a class, the number of girls is 20% more than that of the boys. The strength of the class is 66. If 4 more girls are admitted to the class, the ratio of the number of boys to that of the girls is

Rayan Alam 2 weeks ago

Girls : boys = 120:100=6:5
So,
Girls=66*6/11=36
Boys=66*5/11=30
New ratio=30:(36+4)=3:4

Balram Rajbanshi 8 months ago

let boys be 'x';
then girls 20% more than boys means = x + 20/100 of x = 6x/5
now, boys+ girls = total
x + 6x/5 = 66
11x/5 = 66
x = 30 = boys
then , girls = 6x/5 = 36

4 more girls admitted means = 36 + 4 = 40
Ratio = boys to girls = boys: girls = 30: 40 = 3:4

Ram Sharma 1 year ago

Front where 6:5 comes

Farrukh Saleem 4 years ago

Where 11 comes from

Daxesh Soni 4 years ago

Suppose boys=100
Girls is more than 20% of boys=120
Then 10x+12x=66
22x=66
x=3

Boys=10×=10×3=30
Girls=12x=12×3=36

4 girls are admitted in class
36+4=40

=No.of boys/No.of girls
=30/40
=3/4
Ratio=3:4

Tejasri Nandeti 5 years ago

how do we take 6:5 as girls and boys ratio?

Ashraful Islam 7 years ago

220% = 66
20% = 66*20/220
= 6
Girls = 6*120/20 = 36
Boys = 30
Ratio, 30:40 = 3:4

GNIT CSE 8 years ago

There are 720 students in a school the ratio of the number of boys to girl is 7:2 . if 40 new boys are admitted, find how many new girls should be admitted so that the ratio of the number of boys to the number of girls may be changed to 10:3?

Satish Kumar 9 years ago

Ratio is 6:5 so total 11is equal to 66 it's divisible is 6 so 6multiply by ratio. Ratio is 36:30 4 girls add so 40 : 30 ans is 4:3....

Dhananjay Barman 9 years ago

According to question
(Required Ratio)
2*15/100:3*10/100:5*20/100
2*15:3*10:5*20
3:3:10

Iazfas Uoy 10 years ago

let the number of boys is x
the number of girls = 120% of x = 120/100*x = 6x/5
so x+6x/5 = 66
11x/5 = 66
x = 30
num of boys is 30 and num of girls is 6*30/5=36
4 girls added then 36+4 =40
required ratio= 30:40 = 3:4