exam Maths Puzzle Numerical Ability

If $4000 is invested at 6%, how much must be invested at 3% so that the total annual income will be $270?

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exam Other Question

what is the minimum score needed to make on the 5th test so that the mean test score is at least 85? The first 4 test were 87, 92, 76, and 89 What are the roots of (4x-3)^2=36?