MATH PUZZLE: Can you replace...

An 85-year-old couple, after being married for almost 60 years, died in a car crash. They had been in good health the last ten years, mainly due to her interest in health food and exercising. When they reached the Pearly Gates, St. Peter took them to their mansion, which was decked out with a beautiful kitchen, master bath suite and a Jacuzzi. As they looked around, the old man asked St. Peter how much all this was going to cost.

'It's free,' St. Peter replied, 'this is Heaven.' Next, they went out in the back yard to survey the championship-style golf course that the home was located on. They would have golfing privileges every day and each week, the course changed to a new one representing the great golf courses on earth. The old man asked, 'What are the green fees?'

St. Peter replied, 'This is heaven, you play for free.' Next, they went to the club house and saw the lavish buffet lunch with the cuisine's of the World laid out. 'How much to eat?' asked the old man.

'Don't you understand yet? This is heaven, it is free!' St. Peter replied, with some exasperation. 'Well, where are the low fat and low cholesterol tables?' the old man asked timidly. St. Peter lectured, 'That's the best part - you can eat as much as you like of whatever you like and you never get fat and you never get sick. This is Heaven.'

With that, the old man went into a fit of anger, throwing down his hat and stomping on it, and screaming wildly. St. Peter and his wife both tried to calm him down, asking him what was wrong. The old man looked at his wife and said, 'This is all your fault! If it weren't for your blasted bran muffins and exercise, I could have been here ten years ago!'