There are 30 camels in the safari park, and the number of camels is 50% more than that of giraffes. How many giraffes are there?
野生动物园里养了30只骆驼，养的骆驼的只数比长颈鹿多50%，长颈鹿有多少只？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">30 / (3/2)</gadget>
<output>20</output>

<result>20</result>