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?
A third of $30 is $30*(1/3) = $
<gadget id="calculator">30*(1/3)</gadget>
<output>10</output>
10.
She spent $10 from $30 leaving $30-$10 = $20.
She spent another $8 leaving $20-$8 = $
<gadget id="calculator">20-8</gadget>
<output>12</output>
12 which she saved.

<result>12</result>