exam Maths Puzzle Numerical Ability

An investment of $5000 is made at an annual simple interest rate of 5.3%. How much additional money must be invested at an annual simple interest rate of 8.5% so that the total interest earned is 6.5% of the total investment?

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one pump can fill a tank with oil in 4 hours. a second pump can fill the same tank in 3 hours. if borh pumps are used at the same time, how long will they take to fill the tank. A bag contains three red balls, five white balls and two green balls. If three balls are selected at random, with replacement, find the probability that the first two are red and the third one is green.