The sum of the three numbers A, B, and C is 70. The difference between the number A minus the number B is just equal to the number C. What is the number A?
甲、乙、丙三个数相加的和为70，甲数减去乙数的差正好与丙数相等，甲数是多少．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">70 / 2</gadget>
<output>35</output>

<result>35</result>