exam Maths Puzzle Numerical Ability

x+2z=4 Step #1 [1 0 2:2]
x+y+z=6 [1 1 1:6]
3x+3y+4z=28 [3 3 4:28]

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exam Other Question

Four fishermen collected fish. Each one (sequentially) took turn to take his (equal) share of fish from the pile, leaving an ever decreasing remainder for the next guy. If after al Find and simplify the difference quotient of f, [f(x+h) - f(x)] / h , for the function, h does not equal 0.