book Maths Puzzle Numerical Ability

a-[a-2b+{2c-b-(a-3b-ca)}]

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solve the linear system...if the system is inconsistent or dependent, so state...

x/6 + y/3 = 8
x/4 + y/2 = 12 the first side of a triangle is 7cm shorter thatn twice the second side. the third side is 4cm longer than the first side. the perimeter is 80. find the length of each side. please help me out with these problems.