To find the cost of 7 cans of nuts, we first need to determine the price per can.

Given:

• 8 cans cost $20.

The price per can is:

$\text{Price per can} = \frac{20}{8} = 2.50 \text{ dollars per can}.$

Now, to find the cost of 7 cans:

$\text{Cost of 7 cans} = 2.50 \times 7 = 17.50 \text{ dollars}.$

So, the cost to buy 7 cans of nuts is $17.50.

Would you like more details or have any questions?

Here are 5 related questions to further explore:

1. What would be the cost of 10 cans of nuts?
2. How many cans can you buy with $50?
3. If the price per can increases by 10%, what would be the new cost of 7 cans?
4. What is the total cost for 12 cans if 8 cans cost $20?
5. How much would 5 cans of nuts cost?

Tip: When dealing with unit prices, always divide the total cost by the number of units to find the price per unit!