PartialMathematician

40% of 12% is 4/10 * 3/25 = 12/250 --> 4.8/100, or 4.8%. 12% - 4.8% = 7.2%, so \(\boxed{7.2 \%}\) of the mammals at the aquarium are female otters.

Hope this helps, 

- PM

n = 98

No, the factor that is in all the products is 15, which is why it is highlighted.

Not necessarily...If Guest meant the fraction 1.483 with a repetent above the 3, the decimal is completely different. I believe that Guest was thinking about this decimal since it is a lot harder and a more difficult math problem. 

                                         _

This is your decimal: 1.483, which is basically 1.483333333...

We can do this: we want to take away decimal part, including the repeating part.

X = 1.483 repeating 3

      10X = 14.833 repeating 3

  -       X = 1.483 repeating 3

_______________________

        9X = 13.35

X = \(\dfrac{13.35}{9} \Rightarrow \dfrac{1335}{900} \rightarrow \dfrac{89}{60} \Rightarrow \boxed{1\dfrac{29}{60}}\). 

1 29/60 or 89/60 is the closest fraction to 1.483 repeating 3. 

Hope this helps,

- PM

The answers are approximate, so if you check the values, your results might be a few cents more expensive than the original cost. 

By the way, is this a real math question? I feel like the similarity in the topic of the math problem (ribeyes) and your username is not a coincident. 

lets call the ribeye R and the salmon S. (R is the # of ribeyes. btw, what is a ribeye?)

We have the equations 11R + 18S = 554.59 and 30R + 9S = 582.58. We can multiply the second equation by 2 to get 60R + 18S = 1165.16.

We can form the system of equations. 

          60R + 18S = 1165.16

    -     11R + 18S = 554.59

_______________________

          49R           =  610.57     --> R = 12.46.

Now susbtitute R = 12.46 into the first equation (11R + 18S = 554.59). We have 11(12.46) + 18S = 554.59 --> 18S = 417.53 --> S = 23.2. 

The ribeye costs $12.46 and the salmon costs $23.20. 

- PM

You are very welcome! 

No, its not strange. This website features many different tools, such as the scientific calculator and forums, and you can use them however you want.

Good afternoon for me lol 

Let's use X to represent adult dinos and 3X to represent baby dinos. 

Our equation is 7X + 3X(15) = 208. Simplifying, we have 52X = 208. If we divide both sides by 52, we are left with X = 4.

If X = 4, then 3X = 12. 

There are 12 baby dinos and 4 adult dinos.

Hope this helps,

- PM