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Unit digit of 769 = 7(4 x 17 + 1) = 1 × 7 = 1 × 7 = 7 Unit digit of 394 = 3(4 x 23 + 2) = 1 × 32 = 1 × 9 = 9 Unit digit of 942 = 9(4 x 10 + 2) = 1 × 92 = 1 × 81 = 1 × 1 = 1 Unit digit of (7 × 3 × 9) = 7 × 9 × 1 = 63 or unit digit = 3
The angle of elevation of a tower from a certain point of bus stand is 30°. When a man walks 5m ahead in the direction of the tower, the angle of el...
A boat can travel 24 km upstream and 30 km downstream in 4 hours. Find the speed of the boat in still water if the speed of the stream is 3 km/h.