Dorji’s family has three livestock: goats, sheep and yaks. The number of goats and sheep accounts for 8/9 of the total number of livestock, and the number of sheep and yaks accounts for 11/18 of the total number of livestock. There are 90 sheep. How many livestock?
多吉家养了山羊、绵羊和牦牛三种家畜，山羊和绵羊的数量占家畜总数的(8/9)，绵羊和牦牛的数量占家畜总数的(11/18)，绵羊有90只，多吉家共有家畜多少只？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">11 / 18</gadget>
<output>11/18 = around 0.611111</output>

<gadget id="calculator">(11/18) - 1</gadget>
<output>-7/18 = around -0.388889</output>

<gadget id="calculator">(8/9) + (-7/18)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">90 / (1/2)</gadget>
<output>180</output>

<result>180</result>