Answer:
Jennifer age = 20.
Step-by-step explanation:
Given : Jennifer is now 3 years older than Peter. If, in 12 years, the sum of their ages will be 61.
To find : how old is Jennifer now.
Solution : We have given
Let the age of Peter = x .
According to question
Jennifer is now 3 years older than Peter.
Jennifer age = x + 3
After 12 year
Peter age = x + 12
Jennifer age = x + 15
Sum of their age would be 61.
x +12 + x +15 = 61.
2x + 27 = 61 .
2x = 61 - 27.
2x= 34.
On dividing both sides by 2
x = 17
Peter age = 17.
Jennifer age = 20.
Therefore, Jennifer age = 20.
Opening up the bracket
-5x-4x+24= -3
-9x= -3 - 24
-9x = -27
divide both sides by -9
x= 3
Answer:
± 6
Step-by-step explanation:
Given
= 
= + 6 or - 6 , that is ± 6
