exam Maths Puzzle Numerical Ability

PQR is an isoceles triangle such that QP = QR = 13cm and the altitude PS = 12cm. Find the length of PR.

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find the surface area and volume of a sphere which has a diameter of 48 cm. The revenue of selling x coffee makers is given by R = x(43-0.2x)dollars. The cost of each coffee maker is $19.00 Hw many coffee makers must be sold to achieve a profit of at least