Hi,

How many liters of pure baking soda must be added to get a 60% baking soda solution

Let x be the number of liters of pure baking soda to be added

.30*100L  + 1.00*x = .60(100L + x)

.30*100L  + 1.00*x = .60*100L + .60x

simplify and solve

x - .60x = .60*100L  - .30*100L

.4x = .30*100L

x = 75L

checking our answer

30L + 75L = .60*175L = 105L 

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