Imagine a question and stream-of-consciousness explanation for which this is the answer: 12
Question: Annabelle collected a weekly allowance of $30. She spent a third of it buying junk food, then spent another $8 on sweets. Out of guilt she decides to save the rest. How much did she save?
Stream-of-consciousness: A third of $30 is $30 * (1 / 3) = $10. She spent $10 from $30 leaving $30 - $10 = $20. She spent another $8 leaving $20 - $8 = $12 which she saved.