There are 10 possible digits and 26 possible letters.
To find the answer to this problem we have to multiply 9 as many digits has the hotel reservation number and 26 as many letters it has.
It means:

There are 1,119,214,746 possible reservation numbers.
15 cups of flour, because 72 cookies is 6 batches of a dozen, and 6 times 2.5 is 15
Answer: Yes, there is something missing.
Step-by-step explanation: Given that Charlie gathers apples pears and plums. The number of apples and plums are 10 partners, there are the same number of apples and pears.
Since there are 10 partners of apples and plums, so
number of apples = number of plums = 10.
Also, number of apples and number of pears are same, therefore, number of pears = 10.
Thus, total number of fruits = 10+10+10 = 30.
Hence, Charlie couls gather 30 fruits.
So, this was missing in the calculation.
Answer:
20,000 + 500 + 20 + 7= 28,527
To answer the question above, convert first the gallons to quarts. Each gallon is composed of 4 quarts such that 3 gallons is equal to 12 quarts. Dividing this value by 3 and multiplying by 2, the answer would be 8. Thus, 8 cups will be needed to make the juice.