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Mixing 62 kg of seawater with 84 kg of rainwater creates water containing 3.1% salt. What is the percentage of salt in the seawater?

(Salinity concentration = (Salt weight) / (Water weight + Salt weight) x 100 [%])

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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