21.
If 6 men working 8 hours a day earn Rs.
840 per week, then 9 men working 6 hours a day will earn how much per week?.
[I. Tax 1988]
A.Rs.
840 B.Rs. 1620
C.Rs.
945 D.Rs. 1680
Answer: Rs. 945
Explanation: (Men 6:9) : (Hrs/Day 8:6) :: 840 : x
hence 6 * 8 *x = 9 * 6 * 840 or x = 9*6*840/ 6*8 = 945
