Distribute a bag of candy to 10 children, and there is still some left over 3 yuan per person, but 4 yuan per person is not enough, the remaining is as much as the insufficient, think about it. How many candies are there in total?
把一包糖分给10个小朋友，每人3块还剩下一些，每人4块又不够，剩下的和不够的同样多，想一想．共有多少块糖？
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">30 + 5</gadget>
<output>35</output>

<result>35</result>