Carpenter A can make a chair in 6 hours, carpenter B in 7 hours and carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days?
(a) 61 (b) 67 (c) 73 (d) 79
(c) In 6 hours, number of chairs made by carpenter A = 1
Similarly in (21 × 8) hours, number of chairs by
Hence, total number of chairs in 21 days
= 28 + 24 + 21 = 73
