Solve this problem in the comparing coefficient method- 2 x^4 "-13x^3" +19x^2 +5x +1 ≡ (x-4)(Ax+1)(x^2 +Bx +1) +C is true for all the values of x ; Find the values of A, B and C

12

Step-by-step explanation:

Let the age of Ava be x , the age of Aiden be y and the age of Charlie be z.

Average of their age implies : x + y + z / 3 = 8

multiplying through by 3 , we have:

x + y + z =  24 equation 1

Also , twice the sum of ages of Ava and Charlie implies

2 ( x + z) = 24

dividing through by 2 , we have

x + z = 12 equation 2

substituting equation 2 into equation 1 , we have

12 + y = 24

y = 24 - 12

y = 12

Since y represents Aiden's age , this means that Aiden is 12