book Maths Puzzle Numerical Ability

what is the formual for the area of a triangle?

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This is the question: A chemist wants to mix 46% and 56% alcohol solutions to make 40 liters of 47% alcohol solution. How many liters of 46% alcohol solution is necessary?(Please Help) An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?

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