Exam Maths Puzzle Numerical Ability

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?

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Exam Other Question

Find out the missing number

10,15,23,31,?,49
There are three co-prime numbers.If the product of first two numbers is 551 and product of second and third number is 1073 then find the sum of three numbers?

Options:
A:75
B:85
C:74
D:84