Question

the average age of a, b and c is 17years. if a is replaced by d, the average age of the group increased to 2. so the age of D is?​

Answer 1

Answer:

a + 6

Step-by-step explanation:

a+b+c/3 = 17

=> a + b + c = 51 ------> equation 1

d + b + c/3 = 17 + 2

=> d + b + c = 57 -------> equation 2

Subtract equation 2 from equation 1

d - a = 6

d = a + 6