Please, someone, help thank you

1:2

135/270

27/54 5×27/2×54

3/6 9×3/9×6

1/2 3×1/3×2

answer:  

step-by-step explanation:

odd numbers are only divisible by 1 and itself.

even numbers are divisible by more than 1 and itself.

for example 6 is even because it is divisible by more than 1 and its self. 1 x 6= 6 ; 2 x 3= 6

and 7 is odd because only 7 x 1 equals seveb