A boy has 5 cards. His brother has 3 fewer cards than he has. How many cards do they have together?
His brother has 5 - 3 = 
<gadget id="calculator">5-3</gadget>
<output>2</output>
2 cards.
Together, they have 5 + 2 = 
<gadget id="calculator">5+2</gadget>
<output>7</output>
7 cards.

<result>7</result>