Kindergarten bought some apples and distributed them to the big class, middle class and small class according to the ratio of 3:5:7. Among them, the big class was divided into 35 apples. How many apples are there in this batch?
幼儿园买来一些苹果，按3：5：7分给大班、中班和小班，其中大班分到35个，这批苹果共多少个？
<gadget id="calculator">3 + 5 + 7</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">35 / (7/15)</gadget>
<output>75</output>

<result>75</result>