Answer:
Step-by-step explanation:
He collected a total of 225 stamps. If 88% of the stamps he collected were foreign, how many other stamps did he collect?
Answer: 130 degrees
Step-by-step explanation:
105+80+45+x=360
230+x=360
-230 both sides
X=130 degrees
Answer:
11 years old
Step-by-step explanation:
If four brothers have the average age 6, then the sum of their ages is

years.
Let x years be the age of sister. If four brothers and their sister have the average age 7, then

Multiply this equation by 5:

The sister is 11 years old.
First Column, -x and 5 third column, -x and 2