Brenda mails a package to a grandson that weighs 210 grams. About how many ounces is the package? Use 1 ounce $\approx 28.4$ grams.

Step 1 ：Brenda mails a package to a grandson that weighs 210 grams. We are asked to find out how many ounces is the package, given that 1 ounce is approximately equal to 28.4 grams.

Step 2 ：To solve this problem, we need to convert the weight of the package from grams to ounces. We can do this by dividing the weight of the package in grams by the number of grams in an ounce.

Step 3 ：Let's denote the weight in grams as $weigh{t}_{grams}=210$ and the conversion factor as $gram{s}_{ounce}=28.4$.

Step 4 ：We can calculate the weight in ounces as $weigh{t}_{ounces}=\frac{weigh{t}_{grams}}{gram{s}_{ounce}}$.

Step 5 ：Substituting the given values, we get $weigh{t}_{ounces}=\frac{210}{28.4}\approx 7.394366197183099$.

Step 6 ：Final Answer: The package is approximately $\boxed{{\displaystyle 7.39}}$ ounces.