pritiseth81 pritiseth81

30-01-2021
Mathematics

contestada

PLS HELP ME!!! How much pure alcohol must a nurse add to 10 cm3 of a 60% alcohol solution to strengthen it to a 90% solution?

Respuesta :

maelucy399 maelucy399

30-01-2021

Answer:

30cm3

Step-by-step explanation:

she already has: 60%:10

pure ones: 100%:x

need:90%:10+x

so u can get this eq:

6+x=9+0.9

0.1x=3

x=30

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