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Please help! A scientist mixed a 26% saline solution with 40mL of 50% saline solution to make a 42% saline solution. How much 26% saline solution should the scientist do?

Respuesta :

mhanifa

Answer:

  • 20 ml

Step-by-step explanation:

x ml of 26% saline solution mixed with 40 ml of 50% saline solution to obtain a 42% saline solution.

The amount of salt is same at the input and output:

  • 0.26x + 0.5*40 = 0.42*(40 + x)
  • 0.26x + 20 = 16.8 + 0.42x
  • 0.42x - 0.26x = 20 - 16.8
  • 0.16x = 3.2
  • x = 3.2/0.16
  • x = 20

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