a can do a piece of work in 10 days and b alone can do it in 20 days. how much time will both take to finish the work? Choose the correct option: A) 5.333 B) 6 C) 6.666 D) 8.333 E) 9
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/10) + (1/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 / (3/20)</gadget>
<output>20/3 = around 6.666667</output>

<result>C</result>
a can do a piece of work in 10 days and b alone can do it in 20 days. how much time will both take to finish the work?
divide(const_1, add(divide(const_1, 10), divide(const_1, 20)))
"this question can be solved by different methods . we need to conserve time in exams so solving this problem using equations is the good idea . time taken to finish the job = xy / ( x + y ) = 10 x 20 / ( 10 + 20 ) = 200 / 30 = 6.666 days answer : c"