The answer to your question is,
Ed is 27. His brother is 9.
How did I get this answer?
Ed's age is twice that of his brother. So of course, when you divide 36 by 2, you would get 18. They are not twins so this wouldn't be the answer. You need to divide 18 by 2 again. This makes 9. If you add 9 to 27, that makes 36. Which is their ages.
-Mabel <3
I used photo math hope this helps just know it's going downward because 3/4 is negative
M=months
400+20m=100+40m
300=20m
m=15 months
After 15 months total savings of two options are the same.
Total savings=400+20*15=700 with either options
