In DOS and Windows, the letters "A" and "B" are generally reserved for diskettes; letters for hard disks start with "C".
Floppy drives are identified by drive letters A and B. To change between them, simply enter CD A: or CD B:
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4b.
b
4b
b+b+b+c+c+c+c =3b+4c
b + b + b + c + c + c + c = 3b + 4c
a+b+c+d+e = 30 (i) c+e = 14 (ii) d+b = 1 (iii) a = 2b-1 (iv) a+c = 10 (v) By (i)-(ii)-(iii): a = 15 then, by (iv): b = 8 and by (v): c = -5 Also, b = 8 so by (iii): d = -7 and then by (i), e = 19
a-b+a-b+2b+a = 4a
3b