Q. 85.0( 2 Votes )

A school has 630 students. The ratio of number of boys to number of girls is 3:2. This ratio changes to 7:5 after the admission of 90 new students. Find newly admitted boys.

Answer :

New ratio = 7:5

Let ratio be x


Number of boys = 7x


Number of girls = 5x


Total students = 630 + 90 = 720


Total students = Number of boys + Number of girls


720 = 7x + 5x


720 = 12x


x = 60


Number of boys = 7x


= 60×7


= 420


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Goprep Genius Quiz on Linear EquationsGoprep Genius Quiz on Linear EquationsGoprep Genius Quiz on Linear Equations34 mins
NCERT | Linear EquationsNCERT | Linear EquationsNCERT | Linear Equations41 mins
Interactive session on Linear Equations in Two VariablesInteractive session on Linear Equations in Two VariablesInteractive session on Linear Equations in Two Variables30 mins
NCERT |  Imp. Qs. on Linear Equations in Two VariablesNCERT |  Imp. Qs. on Linear Equations in Two VariablesNCERT | Imp. Qs. on Linear Equations in Two VariablesFREE Class
Quiz | Testing Your Skills on Linear Equation in Two VariablesQuiz | Testing Your Skills on Linear Equation in Two VariablesQuiz | Testing Your Skills on Linear Equation in Two Variables36 mins
Quiz | Important Questions on Linear Equations In Two VariablesQuiz | Important Questions on Linear Equations In Two VariablesQuiz | Important Questions on Linear Equations In Two Variables49 mins
Champ Quiz | Do you Know about Linear Equations ?Champ Quiz | Do you Know about Linear Equations ?Champ Quiz | Do you Know about Linear Equations ?35 mins
Master Linear EquationsMaster Linear EquationsMaster Linear Equations40 mins
Quiz | Imp. Qs. on Linear EquationsQuiz | Imp. Qs. on Linear EquationsQuiz | Imp. Qs. on Linear Equations44 mins
Quiz | Solve Problems on Linear EquationsQuiz | Solve Problems on Linear EquationsQuiz | Solve Problems on Linear Equations37 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses