The sum of the number A and the number B is 150, the sum of 4 times the number A and 7 times the number B is 795, what is the number A?
甲数与乙数的和为150，甲数的4倍与乙数的7倍之和是795，甲数是多少．
<gadget id="calculator">4 * 150</gadget>
<output>600</output>

<gadget id="calculator">795 - 600</gadget>
<output>195</output>

<gadget id="calculator">195 / 3</gadget>
<output>65</output>

<gadget id="calculator">150 - 65</gadget>
<output>85</output>

<result>85</result>