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Mumz [18]
3 years ago
14

A nurse mixes 50 cc of a 60% saline solution with a 20% saline solution to produce a 28% saline solution. How much of the 20% so

lution should he use?
Mathematics
2 answers:
Alex17521 [72]3 years ago
6 0

Answer:

  • 200 cc

Step-by-step explanation:

Let x be the added 20% solution.

<u>The salt content is same:</u>

  • 50*0.6 + x*0.2 = 0.28*(x + 50)
  • 30 + 0.2x = 0.28x + 14
  • 0.28x - 0.2x = 30 - 14
  • 0.08x = 16
  • x = 16/0.08
  • x = 200
gayaneshka [121]3 years ago
5 0

Let added amount be y .

  • The salt remains same

\\ \tt\Rrightarrow 50(0.6)+0.2y=0.28(y+50)

\\ \tt\Rrightarrow 0.2y+30=0.28y+14

\\ \tt\Rrightarrow 0.2y-0.28y=14-30

\\ \tt\Rrightarrow -0.08y=-16

\\ \tt\Rrightarrow 0.08y=16

\\ \tt\Rrightarrow y=\dfrac{16}{0.08}

\\ \tt\Rrightarrow y=200

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Decomponha os seguintes números a) 1.585 = b) 1.059= c) 2.440 d) 5.329 e) 8.801 f) 9.999 g) 3.718 h) 6.840 i) 7.504 j) 5.225 1)
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c) 2.440 = 2.0 + 0.4+ 0.04

d) 5.329= 5.0 + 0.3+ 0.02+0.009

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1) 4.063 = 4.0 + 0.0+ 0.06+0.003= 4+0.06+0.003

m) 2.597= 2 .0+ 0.5+ 0.09+0.007

Step-by-step explanation:

A medida que nos alejamos del punto decimal, el número de ceros aumenta y el dígito se mueve hacia la derecha.

Los valores después del decimal se denominan décimas, centésimas y milésimas.

a) 1.585 =1.0 + 0.5+ 0.08+0.005

b) 1.059= 1 .0+ 0.0+ 0.05+0.009

c) 2.440 = 2.0 + 0.4+ 0.04

d) 5.329= 5.0 + 0.3+ 0.02+0.009

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g) 3.718 = 3.0 + 0.7+ 0.01+0.008

h) 6.840= 6.0 + 0.8+ 0.04

i) 7.504 = 7.0 + 0.5 +0.004

j) 5.225 = 5.0 + 0.2+ 0.02+0.005

1) 4.063 = 4.0 + 0.0+ 0.06+0.003= 4+0.06+0.003

m) 2.597= 2 .0+ 0.5+ 0.09+0.007

The values after the decimal are called tenths hundredths and thousandths

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