exam Maths Puzzle Numerical Ability

PQR is an isosceles triangle such that QP=QR=13cm and the altitude PS=12cm . Find the length of PR ? (ANS- 14.4)

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I have to solve for x.
a/3 = x/21 Saving for Dream Vacation. Kimberly makes $8,000 more a year than her husband. Kimberly saves 10% of her salary for vacation, her husband saves 8%. Together the saved $5,660 per year. How much does Kimberly and her husband make?