A:B=7:3, the number of A is 35, what is the number of B.
甲：乙=7：3，已知甲数是35，乙数是多少．
<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>