Respuesta :

Answer:

20 boys in class

Step-by-step explanation:

easy

x+(x+5)=35

30=2x

x=15

Erlea

Answer:

let X be number of boys & y be number of girls in the class

x +y = 35 .....eq 1

x = y +5

y = x -5.......... eq 2

substitute eq 2 in eq 1

x + x -5 =35

2x = 40

x = 20