There are 30 more basketballs than volleyballs in the school. It is known that the ratio of basketball, football, and volleyball is 5:4:3. How many balls are there in total?
学校里的篮球比排球多30只，已知篮球、足球、排球的比是5：4：3三种球共有多少只？
<gadget id="calculator">5 + 4 + 3</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/12) - (1/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">30 / (1/12)</gadget>
<output>360</output>

<result>360</result>