3 years ago

I need help ASAP with all. I CAN GIVE BRAINLIST.

Mathematics

2 answers:

slava [35]3 years ago

8 0

The first person is correct!

Lady bird [3.3K]3 years ago

5 0

Answer:

A) the unknown is 5

B) the unknown is also 5

C) unknown is 23

D) unknown is 19

Step-by-step explanation:

Hope this is right and helps!

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If there are 400 cubic centimeters of a chemical in 1 liter of solution, how many cubic centimeters of water must be added to di

mars1129 [50]

$1l=1dm^3\\1dm=10cm\to1dm^3=(10cm)^3=1000cm^3\\\\1l=1000cm^3\\-------------\\ \begin{array}{ccc}400cm^3&-&25\%\\1000cm^3+x&-&100\%\end{array}\\cross\ multiply\\25(1000+x)=400\times100\\25000+25x=40000\ \ \ \ \ |subtract\ 25000\ from\ both\ sides\\25x=15000\ \ \ \ |divide\ both\ sides\ by\ 25\\\boxed{x=600\ (cm^3)}\\\\Answer:Must\ be\ added\ 600cm^3\ of\ water.$