A housewife goes to the market. She spent 2/3 of her $150. How much does she have left?
The housewife has 3/3 - 2/3 = 1/3 of $150 left.
This means she has $150 * (1/3) = $
<gadget id="calculator">150*(1/3)</gadget>
<output>50</output>
50 left.

<result>50</result>