book Maths Puzzle Numerical Ability

can you please help me with this problem {3a+b+c=7
{ a+3b-c=13
{ b=2a-1

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book Other Question

How many 8-digits whole numbers can be written with eight different digits, assuming that the leading digit cannot be zero? x+9y+z=20
x+10-2z=18
3x+27y+2z=58