8 persons can build a wall 140m long in 42 days. In how many days can 30 persons complete a similar wall 100 m long? Answers:	A) 12	B) 10	C) 8	D) 6	E) 4
Explanation:   Work done by 8 persons working 42 days = 140   Work done by 1 person working 42 days =140/8   Work done by 1 person working 1 day =140/8×42   Work done by 30 persons working 1 day   =30×140/8×42=100/8   Assume that 30 persons working xx days complete a similar wall 100 m   =&gt; Work done by 30 persons working x days = 100   Hence x=100/(100/8)= 
<gadget id="calculator">100/(100/8)</gadget>
<output>8</output>
8   Answer: Option 8
<result>C</result>
8 persons can build a wall 140m long in 42 days. In how many days can 30 persons complete a similar wall 100 m long?