Answer :
Mixing 62 kg of sea water with 84 kg rainwater is created water containing 3.1% salt. Approximately 7.306% of sea water contains salt.
To find the percentage of salt in sea water, we need to calculate the salinity concentration using the given information. First, let's calculate the total weight of the water created by mixing sea water and rainwater:
Total water weight = weight of sea water + weight of rainwater
Total water weight = 62 kg + 84 kg = 146 kg
Next, let's calculate the weight of salt in the water:
Weight of salt = salinity concentration x total water weight
Weight of salt = 3.1% x 146 kg = 4.526 kg (rounded to three decimal places)
Now, let's find the percentage of sea water that contains salt:
Percentage of sea water = (Weight of salt in sea water / Weight of sea water) x 100
Percentage of sea water = (4.526 kg / 62 kg) x 100 ≈ 7.306%
Therefore, approximately 7.306% of sea water contains salt.
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