Hope that there are 20 girls in Class 1 of Primary School, 5 fewer than boys (5/6), how many boys are there in Class 1 of Six?
希望小学六1班女生有20人，比男生的(5/6)少5人，六1班男生有多少人．
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">25 / (5/6)</gadget>
<output>30</output>

<result>30</result>