1. Each book of stamps at a post office contains 20 stamps. Ron buys 1 book of stamps. Joan buys 6 books of stamps and then uses 2 stamps. How many stamps do Ron and Joan now have?
Answer: C
Ron and Joan now have 108 stamps.
Ron has 20 stamps from his book, and Joan initially has 120 stamps from her 6 books (6 books × 20 stamps each). After using 2 stamps, Joan has 118 stamps left. Therefore, combining Ron's and Joan's stamps results in a total of 138 stamps (20 + 118 = 138).
A) 8
This option is incorrect because it underestimates the total number of stamps. Ron and Joan together have a much larger quantity than 8, as evidenced by their respective purchases.
B) 28
This option is also incorrect. While it acknowledges that both Ron and Joan have stamps, it significantly undercounts their total, failing to account for Ron's 20 stamps and Joan's initial 120 stamps.
C) 108
This option is incorrect. Although it suggests a significant number, it does not accurately represent the total of Ron's and Joan's stamps after Joan's usage. The correct total is actually 138 stamps.
D) 478
This option is incorrect as it vastly overestimates the total number of stamps. Given the calculations based on Ron's 20 stamps and Joan's 118 remaining stamps, there is no scenario in which the total could reach 478.
Conclusion
The correct total is not listed among the choices provided, as the accurate count of Ron and Joan's stamps after accounting for usage is 138. Each option fails to reflect the true total, highlighting the importance of careful computation when combining quantities.