Hi, I perfectly understand the solution, but i have a problem with the language.
Before I look the answer provided below, I make an assumption that "the number of stamps that Edward has" means the number of stamps that Edward has BEFORE doris gave him stamps. D-72=4(E)
Could you explain what's the phrase/grammar used in this question that lead us to take "the number of stamps that Edward has AFTER doris gave him stamps." ?
D-72=4(E+72)
Carcass wrote:
Doris and Edward both collect stamps. If Doris gives Edward 72 stamps, then Doris will have 4 times the number of stamps that Edward has. If Doris gives Edward 129 stamps, then Doris will have 3 times the number of stamps that Edward has. How many more stamps than Edward does Doris now have?
A. 156
B. 387
C. 672
D. 750
E. 828