When Jack calculates "50-□*3", he does the subtraction first, and then the multiplication. The result is 135. What is the correct result of this formula?
Jack在计算"50-□*3"时，先算减法，后算乘法，得到的结果是135，这道算式的正确结果是多少．
<gadget id="calculator">135 / 3</gadget>
<output>45</output>

<gadget id="calculator">50 - 45</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">50 - 15</gadget>
<output>35</output>

<result>35</result>