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? Let's think first. Chain of thought:
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.
Therefore, the answer is 28.