Three natural numbers a, b, c, known a*b=30, b*c=35, a*c=42, what is a*b*c?
三个自然数a、b、c，已知a*b=30，b*c=35，a*c=42，求a*b*c是多少？
<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">35 / 5</gadget>
<output>7</output>

<gadget id="calculator">6 * 5 * 7</gadget>
<output>210</output>

<result>210</result>