3, 5, 8 have similar designs (four leaves placed close to a small circle and forming a symmetrical design at the centre of the figure). 2, 6, 9 have similar designs (three of the corners of the main figure are shaded black and there is a pattern formed around a ‘+’ sign at the centre of the figure). 1, 4, 7 have similar designs (there are four small circles at(the corners of the main figure and there is a wheel shaped element at the centre of the figure).
Parvesh is three times as efficient as Dinesh. Parvesh takes 20 days less than Dinesh to complete a book. If both of them work together, then in how many days the book will be completed?
The mean of 21 observations (all different) is 40. If each observation greater than the median is increased by 21, then the mean of observations will become:
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