In windy conditions a helicopter rises 30 m, falls 45 m, rises 20 m, falls 10 m, rises 15 m, then falls 12 m. How far is it now above or below its original position?
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Answer is -8
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Answer is -2m below its original position
30+20+15-12-45-10 = -2
30+20+15-12-45-10 = -2
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