book Maths Puzzle Numerical Ability

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In a walkaton to raise money for a charity, Elisa walked a certain distance a 5 mi/h and then jogged twice that distance at 8 mi/h. Her total time

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The combined ages of Mary and Ann are 44 years. Mary is twice as old as Ann. When Mary was half as old as Ann will be when Ann is three times as old as Mary, when Mary was three ti y = -4x + 3