So first identy the type of series by looking at the relationship, in this case it is arithmetic!
So we know it adds up by the same thing everytime which is 3/40!
Next number will be...27/40 +3/40= 30/40
Simplify 30/40, divide by 10 both 30 and 40 to get........ 3/4
So next fraction is 3/4
