A scientist needs to make 2 liters of saline solution (salt water), in which the salt level must be at 15% concentration (meaning 15%

Question

A scientist needs to make 2 liters of saline solution (salt water), in which the salt
level must be at 15% concentration (meaning 15% of the water is salt).
Unfortunately, the scientist only has two types of saline solution in his
possession. He has saline solution with a 10% concentration level and saline
solution with a 35% concentration level.
10
How much of each type of saline solution should the scientist mix together to
achieve 2 liters of saline solution at a concentration level of 15%?
11
Let I represent the amount 10% saline solution and let y represent the amount
of 35% saline solution.
12
13

in progress 0
Gia Bảo 3 years 2021-08-19T08:13:58+00:00 1 Answers 7 views 0

Answers ( )

  1. Latifah
    0
    2021-08-19T08:15:46+00:00
    Reply

    Answer:

    1.60 L of 10% solution

    0.40 L of 35% solution

    Step-by-step explanation:

    If x = amount of 10% saline solution, and y = amount of 35% saline solution, then:

    x + y = 2

    0.10x + 0.35y = 0.15(2)

    Solve with substitution:

    0.10x + 0.35(2 − x) = 0.15(2)

    0.10x + 0.70 − 0.35x = 0.30

    0.40 = 0.25x

    x = 1.60

    y = 0.40

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )