His sister is 8 and he is 20.
let's say z represents liz. we can make an equation where z+12=4z.
Solve for that and z is equal to 4. Now that was 4 years ago. She should be 8 now?
I hope this is correct because my brain isn't doing so well today.
Answer:
Adam is 20 years old and Liz is 8 years old.
Step-by-step explanation:
Let present age of Adam = x years
Let present age of Liz = y years
Now we will make the equations.
x = y + 12 -------------(1)
For second equation
( x-4) = (y-4) × 4
x-4 = 4y - 16
x = 4y + 4 - 16
x = 4y - 12 -----------------(2)
By substitution method, we substitute the value of x from equations (1) to equation (2).
y + 12 = 4y - 12
y - 4y + 12 = -12
-3y = -12 -12
3y = 24
y = 8
Now we put the value of y in equation (1)
x = 8 + 12 = 20
Therefore, Adam is 20 years old and Liz is 8 years old.
