The quotient of the two numbers A and B is 5. After the two numbers A and B are multiplied by 10 at the same time, the quotient is a; the sum of the two numbers C and D is 5. After the two numbers C and D are multiplied by 10 respectively, the sum of the two products is b. What is the value of a+b?
甲、乙两数的商是5，甲、乙两数同时乘10后，商是a；丙、丁两数的和是5，丙、丁两数分别乘10后，两个积的和是b．则a+b的值为多少．
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">5 + 50</gadget>
<output>55</output>

<result>55</result>