exam Maths Puzzle Numerical Ability

x-1/3 = x+1/5

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exam Other Question

After inheriting some money, a women wants to invest enough to have an annual income of $5,000. If she can invest $20,000 at 9% annual interest, how much more will she have to invest at 7% to achieve her goal? please help to solve :

2 - 3x / 5 + x/3 = 4