Question
A boat goes 40km upstream in 8 hours and 36km downstream
in 6 hours. The speed of the boat in still water.Solution
Let the speed of boat in still water =B and speed of stream =S Speed of boat in downstream B+S=36/6=6km/h Speed of boat in upstream =B-S=40/8=5km/h Now Speed of boat in still water B= (6+5)/2 =11/2=5.5km/h
168, 178, ?, 273, 400, 618, 963
What will come in place of the question mark (?) in the following series?
4, 8, 24, ?, 480, 2880
165      155     135     ?     65      15
...What value should come in the place of (?) in the following number series?
?, 664, 706, 769, 853, 958What will come in place of the question mark (?) in the following series?
4, 2605, 5309, 8118, ?
195% of 1420 + 72 × 25 =?
10, 10, 15, 30, 75, ?
What will come in place of the question mark (?) in the following series?
77, 198, 342, 511, 707, ?
?, 32, 75, 144, 245, 384
24, 42, 60, ?, 96, 114
