Mindbender

A: "I ve been thinking," said Andy. "When you were a third as old as I am, I was as old as you are." Susie smiled. "I'll take your word for it, but I hate to think of ages," she replied. "Do you realise our two ages total a hundred?"

Hardly a happy thought! How old was Susie?

B: "I've figured out a good gimmick for our new 7-digit phone number," said Brenda. "You might find it useful."

John shook his head. "Not if it's like the one you had for our old number. Anyway, let's have it." "Right, it's easy to remember," Brenda told him. "It's just one less than twice the square of its last three digits."

What was the number?