Question
A man travels the first part of his journey at a speed
of 40 km/h and the second part at a speed of 60 km/h. What is the average speed of the man?Solution
Average speed = 2ab / (a+b)               = 2×40×60 / (40+60)              = 48 km/h.
31, 60, 118, 234, 466, ?
17 , 37 , 79 , 165 , ? , 689
166    156    136   ?     66    16
Find the missing character.Â
-1, 5, 23, 59, ?
7, 9, 21, ?, 107, 197
12, 18, 30, 54, ?, 198
What will come in place of (?) Question mark in the given number series.
1, 2, 5, 14, 41, 122, ?
17    18      14       ?      7       32
...What will come in place of the question mark (?) in the following series?
12, 13, 22, 47, 96, 177, ?