The number of students in a certain class does not exceed 60. In a math test, the number of people who scored no less than 90 points accounted for (1/7), the number of people who scored 80----89 points accounted for (1/2), and the number of people who scored 70-- --The number of people with 79 points accounts for (1/3), so how many people get 70 points or less.
某班学生不超过60，在一次数学测验中，分数不低于90分的人数占(1/7)，得80----89分的人数占(1/2)，得70-----79分的人数占(1/3)，那么得70分以下的有多少人．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 - (1/7) - (1/2) - (1/3)</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">42 * (1/42)</gadget>
<output>1</output>

<result>1</result>