A's number is 56, and B's number is 3 less than A's (6/7). What is the B number?
甲数是56，乙数比甲数的(6/7)少3．乙数是多少？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">56 * (6/7)</gadget>
<output>48</output>

<gadget id="calculator">48 - 3</gadget>
<output>45</output>

<result>45</result>