Answer:
Magdalena has 9 puzzles left to complete.
Explanation:
1. Convert the percentage of puzzles you finished to a decimal by dividing by 100%. 55% ÷ 100% = 0.55
2. Multiply the total number of puzzles by 0.55 to get how many puzzles she has already completed. 20 x 0.55 = 11
3. Subtract the amount of puzzles Magdalena has already completed from the total amount of puzzles. 20 - 11 = 9
4. Therefore, Magdalena has 9 puzzles left to complete