First, multiply the amount of time worked each day by 12 to find how much he earned. Then, add the amounts from Tuesday and Thursday to find the total amount of money that he earned.
Tuesday:
Oliver worked 6 3/4 hours. Since he earns $12 an hour, multiply 12 times 6 3/4:
Then, Oliver earned $81 on Tuesday.
Thursday:
Oliver worked 5 1/2 hours. Then, multiply 12 times 5 1/2:
Tuesday and Thursday:
Since Oliver earned $81 on Tuesday and $66 on Thursday, add 81 and 66 to find the total amount of money that he earned:
Therefore, Oliver earned $147 working Tuesday and Thursday.
The answer is: