Sea water

Mixing 63 kg of seawater with 43 kg rainwater is created water containing 2.7% salt. How much percent of seawater contains salt?

Correct answer:

x =  4.5 %

Step-by-step explanation:

m1​=63 kg m2​=43 kg  p=2.7 %   p = 100 ⋅   m1​+m2​ 100x​ ⋅  m1​​   p ⋅   100m1​+m2​​ = 100x​ ⋅  m1​   p ⋅  (m1​+m2​) = x ⋅  m1​  x=p⋅ m1​m1​+m2​​=2.7⋅ 6363+43​=4.5%

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