Write a proportion that can be used to find the cost of 10 notebooks if 3 notebooks cost $1.98.

The solution to the problem is as follows:

For 3 notebooks you pay $1.98 so the ratio is 1:0.66.
For 10 notebooks, then we could scale the ratio and it will become 10:6.60. So they will cost you $6.60.

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The first answer is correct