exam Maths Puzzle Numerical Ability

If 20 men assemble 8 cars in a day, how many men are needed to assemble 12 cars in a day?

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the cost of medical care increased 142.2 points in a 6-year period. if the cost of medical care reached the 326.9 mark, what was it 6 years ago? Part of $20,000 is invested at 5% and the rest at 3%. How much is invested at each rate if the total income is 4.5% of the total investment?