The number A is 21.05, which is 1.7 more than the number B. What is the sum of the two numbers?
甲数是21.05，比乙数多1.7，两数的和是多少？
<gadget id="calculator">21.05 - 1.7</gadget>
<output>19.35</output>

<gadget id="calculator">19.35 + 21.05</gadget>
<output>40.4</output>

<result>40.4</result>