Exam Maths Puzzle Logical Reasoning Missing Character

Find out the missing number

10,15,23,31,?,49

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Exam Other Question

A vessel is full of a mixture of milk and water, comprising 60% milk. 6 litres of the mixture are withdrawn and replaced with pure water. If the milk now comprises 36% of the resultant mixture, how much does the vessel hold? In a square, all the mid points are joined. The inner square is shaded. If the side of the square is a, what is the area of the shaded square?