There are 928 possible words for a spelling bee. If Levi studies 40 words per day, how long will it take to study all of that?

Hint: Try to solve the question by the simple approach of unitary methods. In the unitary method we see the person’s one day work then we take a look into the amount of work given to that person, then we divide total amount of work by one day’s work to find the number of days required to complete the work by the person.

Complete step-by-step answer:
Number of possible words = 928
Number of words Levi studies per day = 40
Number of days required to complete all the words are the total words divided by the number of words memorised per day.
Number of days to complete all the words = $\dfrac{{928}}{{40}} = 23.2$days
Now let’s convert the extra 0.2 days into hours and minutes
$1day = 24hours$
$\left( {0.2} \right)days = \left( {24 \times 0.2} \right)hours$
$\left( {0.2} \right)days = \left( {4.8} \right)hours$
Now let’s convert the extra 0.8 hours into minutes
$1hour = 60\min $
$\left( {0.8} \right)hour = \left( {60 \times 0.8} \right)\min $
$\left( {0.8} \right)hour = 48\min $
So 23.2 days is equal to 23 days 4 hours and 48 minutes.
Total number of days required to complete all the words is 23.2 days or 23 days 4 hours and 48 minutes.

Note: Try not to leave the number of days in decimal form, if possible, extend it to hours and minutes. Sometimes in competitive (single choice questions) exams both the decimal value and the value in hours and minutes are given but only the values selected up to hours and minutes is acceptable. Or if the exact answer is not given round of your answer to the next whole day (total time increases to the end of the day).