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Question
'A' can do a work in 20 days while "B" can do it in 30 days . 'A' and 'B' working together can do it in-
10 days
12 days
15 days
18 days
14 days
ANSWER : 2
Descrption
<p><math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mn>100</mn><mo>&#xD7;</mo><mn>30</mn></mrow><mrow><mn>20</mn><mo> + </mo><mn>30</mn></mrow></mfrac></math> = 12</p>
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