Question

A class of 19 pupils have five more girls than girls. Let n =the number of boys

Answer 1

NO. of students = 19
Boys = n 
Girls = n+5

Equation formation
n + n + 5 = 19
2 n + 5 = 19 
2 n = 19 - 5 
2 n = 14
   n = 7

Boys = 7
Girls = 7 + 5 = 12