So, the answer is :
B. Solution Z, 1L of 70%
Math Home Page
HOME PAGE
Site Map
Compounding question from
the facebook page.
Question:
To make space for new stock, you've been asked to combine 4 bottles of cleaning solution "Z", and then label that bottle with the volume and % concentration. The contents are:
-Bottle 1= 200mL of 75%
-Bottle 2= 300mL of 90%
-Bottle 3= 100mL of 80%
-Bottle 4= 400mL of 50%
-What will you type on the new label?
A. Solution Z, 1L of 78%
B. Solution Z, 1L of 70%
C. Solution Z, 1L of 62%
D. None of the above
How to do this
| bottle #1 |
+ |
bottle #2 |
+ |
bottle #3 |
+ |
bottle #4 |
= |
Total |
|
|
| |
|
|
|
|
|
|
|
|
|
|
| 200 (.75) |
+ |
300 (.90) |
+ |
100 (.80) |
+ |
400 (.50) |
= |
1000 (X) |
|
| |
|
|
|
|
|
|
|
|
|
| 150 |
+ |
270 |
+ |
80 |
+ |
200 |
= |
1000X |
|
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
700 |
= |
1000X |
|
| |
|
|
|
|
|
|
|
|
|
| | |
|
( isolate |
for |
X ) |
|
1000 |
|
1000 |
|
|
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
|
SOLVE |
|
700 |
÷ |
1000 |
= |
.70 |
|
privacy
