Among the ten numbers 1, 2, 3...10, how much less all the prime numbers are than all the composite numbers.
在1、2、3…10十个数中，所有的质数比所有的合数少多少．
<gadget id="calculator">10 - 4 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>