exam Maths Puzzle Numerical Ability

The circular cross section of a bar of chocolate has a radius of 2x cm and the triangular cross section of another chocolate bar has side lengths of
2x + 1 cm, 3x cm and 3x + 4 cm

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exam Other Question

2x+3x+5-4=25

what is the main answer
Li Nguyen invested some money at 3% and $4000 less than that amount at %5. The two investments produced a total of $200 interest in 1 yr. How much was invested at each rate?