The price of a set of desks and chairs is 105 yuan, and the price of the chairs is that of the desks (5/7). How much is the price of the chair? (answer with different knowledge)
一套课桌椅的价钱是105元，其中椅子的价钱是课桌的(5/7)．椅子的价钱是多少元？(用不同的知识解答)
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">105 / 12</gadget>
<output>35/4 = around 8.75</output>

<gadget id="calculator">(35/4) * 5</gadget>
<output>175/4 = around 43.75</output>

<result>175/4 = around 43.75</result>