exam Maths Puzzle Numerical Ability

A zoo master is deciding which birds and mammals will go in five consecutive cages, numbered 1 through 5, left to right. Each cage will contain one of three species of birds- egret

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√3 - √1/3




answer is 2√3
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I need to know how to get the answer. If ben invests $4000 at 4% interest per year, how much additional money must he invest at 5 1/2% annual interest to ensure that the interest he recieved each year is 4 1/2% of the total amount invested?