Given:
Jimmy reads a book with 21,356 words.
Bob reads a book with one-and-a-half times as many words.
To find:
The expression that represents the number of words Bob reads.
Solution:
We have,
Number of words Jimmy reads = 21,356
Bob reads a book with one-and-a-half times as many words. So,
Number of words Bob reads = Number of words Jimmy reads × one-and-one-half
Therefore, the correct option is D.