Question Find the child's age using the dosage formula: $A = \frac{100 \times D}{4 \times N} - 5$. Rearrange the formula to recover the child's age $A$.

Studdy Solution
The formula is now rearranged with the subject being the child's age $A$.
$$A = \frac{25D}{N} - 5$$
This is the formula to calculate the child's age based on the child's dosage $D$ and the usual adult's dosage $N$.