The combined age of A and B this year is 56 years old. There was a year when A’s age was the same as B’s this year. At that time, B’s age was 1/3 of A’s. What is A’s age this year?
甲乙二人今年的岁数相加起来是56岁，曾经有一年甲的岁数与今年乙的岁数相同，那时乙的岁数是甲的(1/3)，则甲今年的岁数是多少岁．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + 1 + (2/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">56 / (8/3)</gadget>
<output>21</output>

<gadget id="calculator">56 - 21</gadget>
<output>35</output>

<result>35</result>