Answer: Let's call Mrs. Gripe's age "G" and her daughter's age "D".
From the information given, we know:
G = 4 * D (Mrs. Gripe is 4 times as old as her daughter)
G + D = 50 (The sum of their ages is 50)
We can substitute the first equation into the second equation:
4D + D = 50
5D = 50
D = 10
So, Mrs. Gripe is 4 * 10 = 40 years old.
To find out when Mrs. Gripe's daughter was born, we subtract her current age from the daughter's age:
40 - 10 = 30
So Mrs. Gripe was 30 years old when her daughter was born.
Explanation: