Answer this word problem

Question

You are randomly selecting 1 number from the numbers 1 through 20, inclusive what is the probability that a number greater than or equal to 15 is chosen 

Answer 1

15, 16, 17, 18, 19, and 20 are the numbers greater than or equal to 15

that makes 6 numbers or six chances

the total number of available numbers is 20

so the probability is 6 out of 20

you can express that as a fraction  6/20

and reduce it to 3/10

three chances out of ten

3:10