Latest M4maths Aptitude Question SOLUTION: no of pupils in class 1 and 11 =3:5 no of pupils in class 1 and 11=7:11 (3:5)*7=21:35 (7:11)*5=35:55 if x:y,y:z=x:y:z like wise 21:35:55 a;b:c we can write as ax+bx+cx like 21:35: