book Maths Puzzle Numerical Ability

what is -4+2

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Scott wants to swim across a river that is 400 meters wide. He begins swimming perpendicular to the shore he started from but ends up 100 down river from where he started because of the current. How far did he actually swim from his starting point? An outboard motor calls for a fuel mixture that has a gasoline-to-oil ratio of 50 to 1. How many pints of oil should be added to 6 gallons of gasoline?