The heart rate of adolescents is about 75 times per minute, and the number of heartbeats per minute of infants is more than that of adolescents (4/5). How many times per minute is the heart rate of infants?
青少年心跳每分钟约75次，婴儿每分钟心跳的次数比青少年多(4/5)，婴儿每分钟心跳多少次？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">75 * (9/5)</gadget>
<output>135</output>

<result>135</result>