book Maths Puzzle Numerical Ability

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7/y - 1/3 = 1/4

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book Other Question

Max Z = 5x1 + 6x2
subject to: 17x1 + 8x2 <= 136
3x1 + 4x2 <= 36
x1, x2 >= 0 and interger
What is the optimal soulition? Z =? Put the answer in the form xx with no additional nu
Do the augmented matrix

x-2x4 =-3
2x2+2x3=0
x3+3x4=1
-2x+3x2+2x3+x4=5
Determine if this system is consistent