The sum of A, B, and C is 100. Dividing A by B, or C by A, is a quotient of 5 with a remainder of 1. What is the number of B?
甲，乙，丙三数和为100，甲数除以乙数，或丙数除以甲数，都是商5余1，问乙数是多少．
<gadget id="calculator">100 - 7</gadget>
<output>93</output>

<gadget id="calculator">93 / 31</gadget>
<output>3</output>

<result>3</result>