###Human: Donny saves $15 on Monday, $28 on Tuesday and $13 on Wednesday. On Thursday he spends half of his total savings so far. How much did he spend?, ### Assistant: Donny saves a total of $15+$28+$13 = $56 across all 3 days
He spends half of his total savings which is $56*(1/2) = $28 
 So the answer is :  28