To celebrate New Year's Day, the students made 42 red flowers and 21 yellow flowers. How many bunches of flowers did the students make in total?
庆祝元旦，同学们做了42朵红花和21朵黄花．每3朵扎成一束，同学们一共做了多少束花？
<gadget id="calculator">42 + 21</gadget>
<output>63</output>

<gadget id="calculator">63 / 3</gadget>
<output>21</output>

<result>21</result>