book Maths Puzzle Numerical Ability

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

x/6 + y/3 = 8
x/4 + y/2 = 12

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book Other Question

15K^3
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5K Simplfy I thought the answer is 3k^3
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5k
The sum of m and n, divided by the difference of m and n