The average heartbeat of a 10-year-old child is about 90 beats per minute. The average number of heartbeats of a newborn is more than that of a 10-year-old child (1/2). How many times does a newborn have an average heartbeat per minute?
10岁儿童平均每分心跳大约90次．新生儿平均心跳的次数比10岁儿童多(1/2)，新生儿平均每分大约心跳多少次？
<gadget id="calculator">1 / 2</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">90 * (3/2)</gadget>
<output>135</output>

<result>135</result>