exam Maths Puzzle Numerical Ability

can you please explain this step by step?
3k+5=11

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exam Other Question

How many kilograms of water must be evaporated from 50 kg of a 10% salt solution to obtain a 15% salt solution? which is the slope of a line perpendicular to the y=-2x+6?
A.2
B.1/2
C.-1/2
D.-6
E.-1/6