Option C is the right answer
½(12) = 6
½(64) = 32
½(30) = 15
½(78) = 39
Let Amanda's age = x.
Gregory's age = x + 5.
Since Gregory is 17 years old.
17 = x + 5
x = 17 - 5
x = 12
Amanda is 12 years old.
You really can’t simply it but if u use disruptive property it would be -x - -8