The sea ice around the south pole fluctuates between 18 million square kilometers in September to 3 million square kilometers in March. During how many months are there more than 15 million square kilometers of sea ice?
3 answers
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As a rough approximation, we will assume that the decrease in area is directly proportional to time.
1. Calculate the number of months between September and March = 6
2. Calculate the total decrease in area
= (18-3) = 15 million square kilometers.
3. Calculate average decrease per month
= 15/6 = 2.5 million square kilometers per month.
Make a list of area each month
September : 18 million sq.km
October : 15.5 million sq.km
November : 13 million sq.km
December : 10.5 million sq.km
...
so during how many months are there more than 15 million square kilometers of sea ice?
1. Calculate the number of months between September and March = 6
2. Calculate the total decrease in area
= (18-3) = 15 million square kilometers.
3. Calculate average decrease per month
= 15/6 = 2.5 million square kilometers per month.
Make a list of area each month
September : 18 million sq.km
October : 15.5 million sq.km
November : 13 million sq.km
December : 10.5 million sq.km
...
so during how many months are there more than 15 million square kilometers of sea ice?
1 answer