Really need help with this problem,would really appreciate it.

[LadyVarmille]

Find the amount of aspirin to give a child age 10 if the usual adult dosage is 325 milligrams?
I came up with 295.5 for the answer but I think I went wrong somewhere.

I used this formula m=cx\c+12
I have tried
m=10*325/10+12=3250/22=295.5. Soo very confused please help me, thanks.

 

[mmm4444bot]

You need to double-check your arithmetic. Otherwise, it all makes sense to me (except for why you would choose to post in lime green on bright white background :cool

You were given this as a valid formula, yes?

You should also have been given definitions for the symbols m, c, and x.

m = child dose in milligrams

c = child age in years

x = usual adult-dose in milligrams

m = c*x/(c + 12)

Note the grouping symbols around the denominator; when texting ratios, we need to show change to Order of Operations (add c+12 first versus x/c plus 12). Cheers

 

[JeffM]

Find the amount of aspirin to give a child age 10 if the usual adult dosage is 325 milligrams?
I came up with 295.5 for the answer but I think I went wrong somewhere.

I used this formula m=cx\c+12
I have tried
m=10*325/10+12=3250/22=295.5. Soo very confused please help me, thanks.

As mmm said, what is with the lime green?

Because I do not want you overdosing your child and assuming c = the child's age = 10

\(\displaystyle \dfrac{10 * c}{c + 12} = \dfrac{10 * 325}{10 + 12} = \dfrac{3250}{22} = 148\ approximately.\)

To reiterate mmm's point, \(\displaystyle c * x\ /\ c + 12\ MEANS\ \dfrac{c * x}{c} + 12 = x + 12,\ which\ clearly\ is\ wrong.\ c * x\ /\ (c + 12)\ MEANS\ \dfrac{c * x}{c + 12}.\)