Final Answer:足球世界杯冠军得主都有谁

To determine how many books will remain unshelved, follow these steps:

1. Calculate the total storage capacity: \text{Total books} = \text{Number of shelves} \times \text{Books per shelf} \text{Total books} = 5 \times 20 = 100 \text{ books}
2. Determine the number of books that can be shelved: Since the total number of books is 150, and the storage capacity is 100 books, only 100 books can be shelved.
3. Calculate the number of books that remain unshelved: \text{Unshelved books} = \text{Total books} - \text{Shelved books} \text{Unshelved books} = 150 - 100 = 50 \text{ books}
4. Determine how many shelves will be completely filled: \text{Filled shelves} = \left\lfloor \frac{\text{Shelved books}}{\text{Books per shelf}} \right\rfloor \text{Filled shelves} = \left\lfloor \frac{100}{20} \right\rfloor = 5 \text{ shelves}
5. Calculate the number of books that remain unshelved: \text{Unshelved books} = \text{Total books} - (\text{Filled shelves} \times \text{Books per shelf}) \text{Unshelved books} = 150 - (5 \times 20) = 150 - 100 = 50 \text{ books}

[ \boxed{50 \text{ books unshelved}} ]