A is 60, (1/4) of A is exactly (1/7) of B, what is B.
A是60，A的(1/4)正好是B的(1/7)，B是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/4) / (1/7)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">60 * (7/4)</gadget>
<output>105</output>

<result>105</result>