Let's denote the number of packs of shirts Mr. Han needs to buy as \( p \).
He already has 7 shirts and needs a total of 85 shirts.
The total number of shirts he will have after buying the packs is the sum of the shirts he already has and the shirts he buys in packs of 10. So, we can write the equation as follows:
\[ 7 + 10p = 85 \]
To find out how many more packs of shirts he needs, you can solve this equation for \( p \).
First, subtract 7 from both sides:
\[ 10p = 85 - 7 \]
\[ 10p = 78 \]
Next, divide both sides by 10:
\[ p = \frac{78}{10} = 7.8 \]
Since Mr. Han can only buy whole packs, we round up to the next whole number, which means he needs 8 packs of shirts.
So, the equation indicating how many more packs of shirts he needs is:
\[ p = \lceil \frac{85 - 7}{10} \rceil \]
This shows that he needs 8 packs of shirts.
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