Exam Maths Puzzle Numerical Ability Probability

A 5 litre jug contains 4 litres of a salt water solution that is 15% salt.if 1.5 litres of the solution spills out of the jug.and the jug is then filled to capacity with water how much salt in mixture in the resulting solution?

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What is the remainder when (6^17+17^6) is divided by 7?? the average age of 24 boys & their teacher is 15 years. when the teacher's age is excluded, the average age decreased by 1 year. the age of the teacher is?