a student was asked to find 4 / 5 of a number. but the student divided the number by 4 / 5, thus the student got 9 more than the correct answer. find the number.
Options
A) 16
B) 18
C) 20
D) 22
E) 24
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">9 * (4/5)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">(36/5) * (4/5)</gadget>
<output>144/25 = around 5.76</output>

<gadget id="calculator">(4/5) * (4/5)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">1 - (16/25)</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">(144/25) / (9/25)</gadget>
<output>16</output>

<gadget id="calculator">16 / (4/5)</gadget>
<output>20</output>

<result>C</result>
a student was asked to find 4 / 5 of a number. but the student divided the number by 4 / 5, thus the student got 9 more than the correct answer. find the number.
divide(divide(multiply(multiply(9, divide(4, 5)), divide(4, 5)), subtract(const_1, multiply(divide(4, 5), divide(4, 5)))), divide(4, 5))
"let the number be x . ( 5 / 4 ) * x = ( 4 / 5 ) * x + 9 25 x = 16 x + 180 9 x = 180 x = 20 the answer is c ."