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Answer :
The inequality given is
$$
2.2S + 1.3N < 145,
$$
where:
- $S$ is the number of days Chisaka spacewalks,
- $N$ is the number of days she does not spacewalk.
### Step 1. Determine Daily Food Consumption
By comparing the inequality with the standard form, we see that:
- Chisaka uses $2.2$ kg of food on each day she spacewalks.
- Chisaka uses $1.3$ kg of food on each day she does not spacewalk.
Thus, Chisaka needs $\boxed{2.2}$ kg of food for each day that she spacewalks, and $\boxed{1.3}$ kg of food for each day that she doesn't spacewalk.
### Step 2. Check the Scenario for 30 Spacewalking Days and 50 Non-Spacewalking Days
We now substitute $S = 30$ and $N = 50$ into the inequality. The total food required is computed as follows:
$$
\text{Food required} = 2.2 \times 30 + 1.3 \times 50.
$$
Calculate each part:
- For spacewalking days:
$$
2.2 \times 30 = 66 \text{ kg}
$$
- For non-spacewalking days:
$$
1.3 \times 50 = 65 \text{ kg}.
$$
Adding these together we get:
$$
\text{Total food required} = 66 + 65 = 131 \text{ kg}.
$$
Since
$$
131 < 145,
$$
Chisaka has enough food for the planned days.
### Final Answer
Chisaka needs $\boxed{2.2}$ kg of food for each day that she spacewalks, and $\boxed{1.3}$ kg of food for each day that she doesn't spacewalk. Also, she can indeed spacewalk for 30 days and not spacewalk for 50 days without running out of food.
$$
2.2S + 1.3N < 145,
$$
where:
- $S$ is the number of days Chisaka spacewalks,
- $N$ is the number of days she does not spacewalk.
### Step 1. Determine Daily Food Consumption
By comparing the inequality with the standard form, we see that:
- Chisaka uses $2.2$ kg of food on each day she spacewalks.
- Chisaka uses $1.3$ kg of food on each day she does not spacewalk.
Thus, Chisaka needs $\boxed{2.2}$ kg of food for each day that she spacewalks, and $\boxed{1.3}$ kg of food for each day that she doesn't spacewalk.
### Step 2. Check the Scenario for 30 Spacewalking Days and 50 Non-Spacewalking Days
We now substitute $S = 30$ and $N = 50$ into the inequality. The total food required is computed as follows:
$$
\text{Food required} = 2.2 \times 30 + 1.3 \times 50.
$$
Calculate each part:
- For spacewalking days:
$$
2.2 \times 30 = 66 \text{ kg}
$$
- For non-spacewalking days:
$$
1.3 \times 50 = 65 \text{ kg}.
$$
Adding these together we get:
$$
\text{Total food required} = 66 + 65 = 131 \text{ kg}.
$$
Since
$$
131 < 145,
$$
Chisaka has enough food for the planned days.
### Final Answer
Chisaka needs $\boxed{2.2}$ kg of food for each day that she spacewalks, and $\boxed{1.3}$ kg of food for each day that she doesn't spacewalk. Also, she can indeed spacewalk for 30 days and not spacewalk for 50 days without running out of food.
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