The dimensions should be 1 2/3 feet by 1 1/2 feet.
To find these amounts, we simply multiply the length of the snake by the given fraction.
For the length, multiply by 2/3.
For the width, multiply by 1/2.
I don't know about the first one but for the second one:

You could buy 13 bananas.
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The next number is 2,464,829,439