If 5 men can paint a wall 100 metres long in 10 days of a 8 hours each. In how many days of 6 hours each will 8 men paint a wall 30 metres long?  Choose one.
A) 1.5 DAY	B) 2 days	C) 2.5 days	D) 3 days	E) 3.5 days
Total hours in 10 days = 10 *8= 
<gadget id="calculator">10 *8</gadget>
<output>80</output>
80 hours.   Total man-hours needed for paint 100m wall= 5 *8= 
<gadget id="calculator">5 *8</gadget>
<output>40</output>
40 man-hours.   Man-hour needed for 1 meter wall painting= 400/100= 
<gadget id="calculator">400/100</gadget>
<output>4</output>
4 man-hour.   Now,   30*4= 
<gadget id="calculator">30*4</gadget>
<output>120</output>
120 m-h to do 30 meters.   120 m-h/8 men= 15 hours.   15 hr/6 hr/day = 2.5 days.   answer : 2.5 days
<result>C</result>
If 5 men can paint a wall 100 metres long in 10 days of a 8 hours each. In how many days of 6 hours each will 8 men paint a wall 30 metres long?