The least common multiple of 9 and 16 minus how much is equal to their greatest common factor.
9和16的最小公倍数减去多少，就等于它们的最大公因数．
<gadget id="calculator">9 * 16</gadget>
<output>144</output>

<gadget id="calculator">144 - 1</gadget>
<output>143</output>

<result>143</result>