m,./ from the bottom row of a keyboard
Y
These sequence stands for: Ten Twenty Thirty Forty Fifty Sixty Seventy would be next in the sequence, so the answer is 'S'.
b
Traffic light sequence. Red, Red/Amber, Green, Amber, Red.
A
A
K
It is: Y
k comes next, and then l.
E
When you answer sequence questions, look for a repetition anywhere. We can see that the first letter and the last letter is an 'F' so the sequence must be FHEXFHEXF.... so your answer is F.
m,./ from the bottom row of a keyboard
v
e
m
To provide necessary context, the original question was "What letter comes next in this sequence? WLCNIT_" Notice the first letter of each word in that question. The answer is S, corresponding to "sequence."