book Maths Puzzle Numerical Ability

An Investment of $3000 is made at an annual simple rate of 9%. How much additional money must be invested at an annual simple interest rate of 10.8% so that both accounts earn the

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book Other Question

factorise 8 x^2+10xy Can someone out there help me with this problem?

How do you find the least common multiple (LCM) for the following group of numbers.
12, 20, and 35. Explain if you can how you come up with your answer.
Thanks!