Answer:
We must solve 3/5 x 3/5.
3/5 x 3/5 = 0.36
The units we'll use is because units are the unt we're given, and it is squared because it is the area of a shape.
Your final answer is 0.36
Answer: 33 gallons
Step-by-step explanation:
We initially have 130 gallons of a
acid solution and we need to change it to a
acid solution, and for that it is necessary to evaporate
gallons of water.
So, this situation can be mathemtically expressed as follows:
![(130)(9\%)=(130-n)(12\%)](https://tex.z-dn.net/?f=%28130%29%289%5C%25%29%3D%28130-n%29%2812%5C%25%29)
Then:
![(130)(\frac{9}{100})=(130-n)(1\frac{12}{100})](https://tex.z-dn.net/?f=%28130%29%28%5Cfrac%7B9%7D%7B100%7D%29%3D%28130-n%29%281%5Cfrac%7B12%7D%7B100%7D%29)
Isolating
:
![11.7=15.6-0.12 n](https://tex.z-dn.net/?f=11.7%3D15.6-0.12%20n)
![n=32.5 \approx 33](https://tex.z-dn.net/?f=n%3D32.5%20%5Capprox%2033)
Hence, we need to evaporate 33 gallons of water.