Master Zhang's original weight was 80 kg. After he persisted in physical exercise, his weight was only 7/8 of the original weight. How much is Master Zhang's weight now?
张师傅原来的体重是80千克，坚持体育锻炼后，体重只是原来的(7/8)，现在张师傅的体重是多少千克？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">80 * (7/8)</gadget>
<output>70</output>

<result>70</result>