exam Maths Puzzle Numerical Ability

In 1990, the life expectancy of males in a certain country was 66.8 years. In 1996, it was 69.5 years. Let E represent the life expectancy in the year t and let t represent the num

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Find real numbers a, b, andcsuch that the graph of the function y=ax^2+bx+c contains the points (-2,-4), (1,-1), and (3,19). In a school vote, 19 percent of the teachers voted yes, whereas 95 percent of the students voted yes. If all teachers and students voted and 91 percent of the voters voted yes, w