is 4:6 and 2:3 equal?

what is equal to 30:15 and 10:5

what is equal to 90: 66 and what is equal to 18:16

what is equal to1:5

is 3:6 equal to 30:73

34:8 is equal to 17:4

a class has 30 boys to 40 girls and twelve more girls entered the room. how many boys are there.