self Maths Puzzle


Q: From 2008 to 2009, book sales decreased by 80%. If sales in 2010 were the same as they were in 2008, by what percent did they increase from 2009 to 2010?

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self Other Question

A prism has as the base a right-angled triangle whose sides adjacent to the right angles are 10 cm and 12 cm long. The height of the prism is 20 cm. The density of the material of the prism is 6 gm/cubic cm. The weight of the prism is Three circles of radii 4cm, 6cm and 8cm touch each other pairwise externally. The area of the triangle formed by the line-segments joining the centres of the three circkes is