exam Maths Puzzle Numerical Ability

Roberto invested some money at 7% and then invested $5000 more than twe the amount at 9%. His total income for two investments was $3950. How much was invested at 9%?

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In square MKJN,diagonal MK measures square of 50 and in rectangle IJKL,diagonal KI measures 13.What is the length of IJ or KL? Steve purchases a rare coin for $100 that will double in value every 9 years. His friend John purchases a rare book for $75 that will double in value every 6 years. If both purchas