exam Maths Puzzle Numerical Ability

Lucy has some money invested at 18% annual interest and three as much invested at 12%. Her total annual income from two investments is 2200pesos. How much was invested at each rate

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A coordinate grid is placed over a map of Pineville. The police department is located at (-12,7) and the fire department is located at (-6,6). What are the coordinates of the town hall, which is located halfway between the police and fire deparments? I would like to know four names of linear equations and the general form and if you could please indicate the meanings of each of the constants and please provide an advantage of u