There are 160 purple tulips and 21 red tulips are 3 times more than purple tulips. How many red tulips are there?
植物园举办花卉展，紫色郁金香有160朵，红色郁金香的朵数是紫色的3倍还多21朵．红色郁金香有多少朵？
<gadget id="calculator">160 * 3</gadget>
<output>480</output>

<gadget id="calculator">480 + 21</gadget>
<output>501</output>

<result>501</result>