exam Maths Puzzle Numerical Ability

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-2(2g - 6) = 10

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An oil tank was 1/10 full then 280 gallons was delivered which made it 8/10 full. If x= the capacity of the oil tank, what equation can be used to find the capacity of the tank? a biologist believes that the lengths of squirrels tails are normally distrubuted with a mean of 8 inches and a standard deviation of .25 inch. if she is right what percentage of s