The product of the sum of the numbers A and B and the number C is 270. It is known that the number of A is 30, the number of C is 3, what is the number of B
甲、乙两个数的和与丙数的积是270．已知甲数是30，丙数是3，乙数是多少
<gadget id="calculator">270 / 3</gadget>
<output>90</output>

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>