exam Maths Puzzle Numerical Ability

In 1992, the life expectancy of males in a certain country was 68.5 years. In 1999, it was 71.6 years. Let (E) represent life expectancy in years t and let (t) represent the number

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Brittany saves the same amount of money each week. She had $250 eight weeks ago. After withdrawing $10, her current balance is $400. How much was she saving weekly? two planes are 1350 miles apart flying toward each other at different altitudes. If one is flying 250mph and the other 290 mph, how long will it take to pass each other?