One day the level of the water in a river was 30 cm above its average level. One week later it was 12 cm below its average level. How far did the water level drop in the week?
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Answer:
42 cm
Step-by-step explanation:
The river water level on the first day was + 30 above average and after a week it was - 12 below average thus, the difference between them is
30- ( - 12) = 30 + 12 = 42 cm
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