Final answer:
To find out how much soda Amanda has left after drinking two fifths of it, we need to subtract two fifths (or 2/5) from the original full bottle. Amanda has 1/10 of the full bottle left.
Step-by-step explanation:
To find out how much soda Amanda has left after drinking two fifths of it, we need to subtract two fifths (or 2/5) from the original full bottle. Since a fraction can be represented as a division problem, we can rewrite 2/5 as the division problem 2 ÷ 5. To subtract fractions, we need a common denominator, so we'll convert the fractions to have a common denominator of 5. In this case, the fractions already have the same denominator, so we can subtract the numerators directly, giving us 3 - 2 = 1. Therefore, Amanda has 1 fifth of the soda left, which is equivalent to one-tenth (or 1/10) of the full bottle.