#39 7.NS.3 (4)

Stella is in charge of bringing bottled water to a party that has 45 guests.

Bottled water is sold in packs of 18 and each pack costs $7.2.

Part A: enter the total number of packs of water Stella will need to bring to the party if each guest is to have 3 bottles of water.

Part B: enter the total cost, in dollars, Stella will spend on bottled water for the party.

Let's solve the problem step by step.

### Part A: Number of Packs Needed
1. **Number of Guests**: 45
2. **Bottles per Guest**: 3
3. **Bottles per Pack**: 18

First, calculate the total number of bottles needed:

\[
\text{Total bottles needed} = 45 \times 3 = 135
\]

Next, calculate the number of packs required:

\[
\text{Number of packs} = \left\lceil \frac{135}{18} \right\rceil
\]

Calculating:

\[
\frac{135}{18} = 7.5
\]

Since Stella cannot purchase a fraction of a pack, she needs to round up to the nearest whole number:

\[
\text{Number of packs} = 8
\]

So, Stella needs **8 packs** of water.

### Part B: Total Cost
1. **Cost per Pack**: $7.20
2. **Number of Packs Needed**: 8

The total cost is calculated by multiplying the number of packs by the cost per pack:

\[
\text{Total cost} = 8 \times 7.2 = 57.6
\]

So, Stella will spend **$57.60** on bottled water for the party.

### Summary:
- **Part A**: Stella will need to bring **8 packs** of water.
- **Part B**: Stella will spend **$57.60**.

Would you

Learn how to calculate the number of water packs needed and the total cost for a party with 45 guests. Stella needs to ensure each guest has 3 bottles of water. Discover the step-by-step solution including multiplication, division, and rounding calculations. Suitable for Grades 4-6.

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