pipe a can fill a tank in 9 hours. due to a leak at the bottom, it takes 12 hours for the pipe a to fill the tank. in what time can the leak alone empty the full tank? Choices:
A) 36
B) 88
C) 18
D) 26
E) 12
<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">108 / 3</gadget>
<output>36</output>

<result>A</result>
pipe a can fill a tank in 9 hours. due to a leak at the bottom, it takes 12 hours for the pipe a to fill the tank. in what time can the leak alone empty the full tank?
divide(multiply(12, 9), subtract(12, 9))
"let the leak can empty the full tank in x hours 1 / 9 - 1 / x = 1 / 12 = > 1 / x = 1 / 9 - 1 / 12 = 1 / 12 = > x = 36 . answer : a"