exam Maths Puzzle Numerical Ability

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?

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exam Other Question

If 20 men assemble 8 cars in a day, how many men are needed to assemble 12 cars in a day? How do you rewrite this expression using the indicated property?

(x+7)+3,Associative Property