Answer:
8years
Step-by-step explanation:
I am x years old and
my brother is 7years .
The sum of our ages is (x+7)
If you take 80% of the sum of our ages the result will be 12.
80%(x+7)=12
(80/100)(x+7)= 12
(4/5)(x+7)=12
These is the equation (4/5)(x+7)=12
Divide both sides by 4/5
(x+7)= 12 /(4/5) = 12×(5/4) = 3 ×5= 15
x+7 = 15
x= 15-7 = 8
My age is x= 8 years
And my brother is x+7 = 8+7 = 15years
Answer: you are 8 years old.
Step-by-step explanation:
You are x years old and your brother is 7years old. The sum of your ages is
(x + 7) years
If you take 80% of the sum of our ages the result will be 12. 80% of the sum of your ages is
80/100 × (x + 7) = 0.8(x + 7)
Therefore,the equation would be
0.8(x + 7) = 12
0.8x + 5.6 = 12
0.8x = 12 - 5.6
0.8x = 6.4
x = 6.4/0.8
x = 8 years
