mary can do a piece of work in 12 days. rosy is 50 % more efficient than mary. the number of days taken by rosy to do the same piece of work is? Choices:
A) 7	B) 8	C) 9	D) 11	E) 10
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">12 / (3/2)</gadget>
<output>8</output>

<result>B</result>
mary can do a piece of work in 12 days. rosy is 50 % more efficient than mary. the number of days taken by rosy to do the same piece of work is?
divide(12, add(const_1, divide(50, const_100)))
ratio of times taken by mary and rosy = 150 : 100 = 3 : 2 suppose rosy takes x days to do the work . 3 : 2 : : 12 : x = > x = 8 days . hence , rosy takes 8 days to complete the work . answer : b