exam Maths Puzzle Numerical Ability

please help me to solve this question.

Determine the present value of a series of 25 semi-annual payments of Rs.10,000 each and which begins in 6 months.Assume interest at a rat

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exam Other Question
an airplane flew for 4 hours against a headwind of 40km/h. on its return the same wind was a tailwind and the flight took 3 hours. whats the planes speed in still air?? what two system of equations could i do? Multiply
(8√[6] + 3√[2])(4√[6] – 5√[2])