Answer: 56, 8
Step-by-step explanation:
Given
The ratio of goldfish to gallons of water is 7:2
If there is 16 gallons of water. For x goldfish, We can write
![\Rightarrow \dfrac{7}{2}=\dfrac{x}{16}\\\\\Rightarrow x=7\times8\\\Rightarrow x=56](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cdfrac%7B7%7D%7B2%7D%3D%5Cdfrac%7Bx%7D%7B16%7D%5C%5C%5C%5C%5CRightarrow%20x%3D7%5Ctimes8%5C%5C%5CRightarrow%20x%3D56)
If there are 28 fish, for y gallons of water we can write
![\Rightarrow \dfrac{7}{2}=\dfrac{28}{y}\\\\\Rightarrow y=2\times 4\\\Rightarrow y=8\ \text{gallons}](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cdfrac%7B7%7D%7B2%7D%3D%5Cdfrac%7B28%7D%7By%7D%5C%5C%5C%5C%5CRightarrow%20y%3D2%5Ctimes%204%5C%5C%5CRightarrow%20y%3D8%5C%20%5Ctext%7Bgallons%7D)
Since we neither want most expensive nor least expensive, we need to go with pillow which is costing $18.49.
So total 4 pillows cost = 4*18.49
= $73.96
8 if not that then its 56 or i might be wrong but it seems right to me