It is known that ●/15=■…▲(▲≠0), if ■=4, what is the maximum of ●.
已知●/15=■…▲(▲≠0)，如果■=4，●最大是多少．
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">60 + 14</gadget>
<output>74</output>

<result>74</result>