The beating rate of the human heart changes with age. Teenagers jump about 77 times per minute, and babies beat more times per minute than teenagers (4/7). How many times does the baby's heart beat per minute?
人的心脏的跳动次数随着年龄的变化而变化．青少年每分约跳77次，婴儿每分跳动的次数比青少年多(4/7)．婴儿每分心跳多少次？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 + (4/7)</gadget>
<output>11/7 = around 1.571429</output>

<gadget id="calculator">77 * (11/7)</gadget>
<output>121</output>

<result>121</result>