6 : 15 and 30 : 80
You must, like when using fractions, convert one of the numbers from one side, which could be 6 and 30, and divide the greater number by the smaller
30 / 6 = 5
Use five on the other side, 15, to increase the value or something
15 x 5 = 75
Now you have 30 : 75 and 30 : 80
30 : 80 is still bigger, so you must put the sign <
