Question

10 students of Class-X took part in a mathematics quiz. If the number of girls is 4 more than the number of boys then, find the number of boys and the number of girls who took part in the quiz.

Answer 1

Let the number of boys be x. 

Then the number of girls = x + 4 

By problem, x + x + 4 = 10 

∴ 2x + 4 = 10 

2x = 10-4

x = 6/2 =3

∴ Boys = 3 Girls = 3 + 4 = 7 (or) 

Boys = x, Girls = y 

By problem x + y = 10 (total) 

and y = x + 4 (girls) 

⇒ x + y = 10 and x – y = – 4

∴ Number of boys = 3 and the number of girls = 7