It is known that (2/3) of the number A is equal to (3/4) of the number B. If the number A is 90, what is the number B?
已知甲数的(2/3)等于乙数的(3/4)，若甲数是90，则乙数为多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/3) / (3/4)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">90 * (8/9)</gadget>
<output>80</output>

<result>80</result>