To find out how many weeks it will take Jason to collect coins from all 195 countries, we can set up an equation based on the information provided.
- Current number of countries collected: 99
- Total countries: 195
- Countries Jason plans to add each week: 4
First, we can calculate how many more countries Jason needs to collect:
\[ \text{Countries needed} = \text{Total countries} - \text{Current countries} = 195 - 99 = 96 \]
Next, we can set up the equation to find the number of weeks \( w \) it will take to collect these 96 countries, given that he adds 4 new countries each week:
\[ 4w = 96 \]
Now, we can solve for \( w \):
\[ w = \frac{96}{4} = 24 \]
Thus, it will take Jason 24 weeks to collect coins from all 195 countries.
Answer: 24 weeks