Ali works as a tutor for $10 an hour and as a waiter for $12 an hour. This month, he worked a total of 99 hours at his two jobs. Let be the number of hours Ali worked as a tutor this month. Write an expression for the combined total dollar amount he earned this month.

Answer 1

Let's call the number of hours Ali worked as a tutor this month "t".

The number of hours Ali worked as a waiter this month is then 99 - t.

The amount of money Ali earned as a tutor this month is 10t, and the amount of money he earned as a waiter this month is 12(99 - t).

The combined total dollar amount he earned this month is 10t + 12(99 - t).