exam Maths Puzzle Numerical Ability

5[2-(2x-4)]=2(5-3x)

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exam Other Question

Hi can you please tell me if this is true of false.

If two angles are supplementary then one angle is acute and one angle is obtuse.

Thank you,
Ali Simplify as much as possible:

1.) y^2 sqrt54yz^2 - 6z sqrt24y^5

2.) sqrt5wt^6 sqrt20w^2t^3

3.) -2 sqrt6 + 3 divided by -2 sqrt6 + 7

4.) sqrt u+30=1