(18/35)*(4/7)+(17/35)*(4/7).
(18/35)*(4/7)+(17/35)*(4/7)．
<gadget id="calculator">18 / 35</gadget>
<output>18/35 = around 0.514286</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(18/35) * (4/7)</gadget>
<output>72/245 = around 0.293878</output>

<gadget id="calculator">17 / 35</gadget>
<output>17/35 = around 0.485714</output>

<gadget id="calculator">(17/35) * (4/7)</gadget>
<output>68/245 = around 0.277551</output>

<gadget id="calculator">(72/245) + (68/245)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>