Question. Eddie is 92 years old. His granddaughter Becky is currently four times younger than he is. The mother of Becky - Irene, is two times her age. How old is Irene?
Answer. 46
What step-by-step reasoning justifies that answer?
Reasoning: Becky is four times younger than Eddie, which means she is 92 / 4 = 23 years old. Her mother is two times older than she, so it means Irene is 23 * 2 = 46 years old.