What is the difference between the product of 90 and (7/15) minus the quotient of 4 divided by (8/17)?
90与(7/15)的积减去4除以(8/17)的商，差是多少？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">90 * (7/15)</gadget>
<output>42</output>

<gadget id="calculator">8 / 17</gadget>
<output>8/17 = around 0.470588</output>

<gadget id="calculator">4 / (8/17)</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">42 - (17/2)</gadget>
<output>67/2 = around 33.5</output>

<result>67/2 = around 33.5</result>