exam Maths Puzzle Numerical Ability

2x-2y=4
2x-2y=24

2x+3y=10
3x+2y=5

x-y=-4
x+y=8

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exam Other Question

what is the property of 3x+5x^2=5x^2+3x olve the problem.

In a right triangle, one acute angle is 54degree more than twice the other. Find each acute angle.