In a raffle, Scott buys 10 tickets and his friend Tom buys 6 tickets. If there are 80 tickets sold, what is the probability that Scott or Tom will win?

80 tickets in total.

-scott has 10

-tom has 6

you've gotta make those into fractions (a fraction is part of a whole number)

let's do scott first,

the total amount of tickets is 80, right?

Scott bought 10 out of the 80

the fraction will look like this 10/80 (to the lowest terms it's 1/8)

put that into your calculator as (1/8) x 100 and it will give you the probability %

you do the same for tom:

he bought 6 out of 80 tickets

the fraction will be 6/80 (lowest terms = 3/40)

put that into your calculator as (3/4) x 100 and you got your probability %