In class of 60,the girls are twice that of boys,karim is ranked seventeenth from the top. if there are 9 girls ahead karim, how many boys are after him
Answers
Answer:
12 boys
Step-by-step explanation:
Total no. of students = 60
Let,
The total no. of boys in the class be x
The total no. of girls in the class = twice the no. of boys = 2x
The total no. of students in the class= no.of boys + no. of girls
60 = x+2x
60=3x
60÷3 =x
20= x
Therefore ,
the no. of boys = 20
and
the no. of girls = 2×20
= 40
The rank of Karim in the class = 17th
No. of girls ahead him = 9
No. of boys ahead him = Total no. of students ahead him - No. of girls ahead him
= 17-9
= 8
No. of boys after him = Total no. of boys - no. of boys ahead him
= 20-8
= 12
Hence,
The no. of boys after him is 12 .