Question

Tickets for a raffle are numbered consecutively. If John sold tickets numbered 67 through 186, inclusive, how many tickets did he sell?

Answer 1

What have you tried so far?

Answer 2

subtract 67 from 186 ?

Answer 3

Okay. Let's think about the problem using a smaller data set. Inclusive means including the end numbers of the interval in your count.

So say he has sold tickets 1 through 3, inclusively. That would be ticket one, ticket two, and ticket three. This adds up to three total tickets sold. The same is true for selling tickets 2 through 4, inclusively.

Do you see a pattern here?