What’s the probability of it being a 6th grader?

Question

A school has a raffle for 130 students in fifth & sixth grade. There are 62 fifth graders. What is the probability that the grand prize winner selected at random from 130 students will be a sixth grader?

Answer 1

Then there are 130-62 = 130-(60+2) = 130-60-2 = 68 of the 6th graders

62/120 = 31/60 = 0.516 = 51 and 2/3 %