When multiplying two numbers, if one factor increases by 3, the product increases by 51, and if the other factor decreases by 6, the product decreases by 150, then what is the sum of the two numbers?
两个数相乘，如果一个因数增加3，积就增加51，如果另一个因数减少6，积就减少150，那么两个数和为多少．
<gadget id="calculator">51 / 3</gadget>
<output>17</output>

<gadget id="calculator">150 / 6</gadget>
<output>25</output>

<gadget id="calculator">17 + 25</gadget>
<output>42</output>

<result>42</result>