1. "You've been scribbling and cursing," said Martin. "What's the problem?" "It's a girl I met, Dad," Dave replied. "She wouldn't give her phone number. Only that its initial 3-digit part is 447 more than the last three digits of its 4-digit second part, but 447 less than the first three of that second part." What was the complete 7-digit number?

Phone number 452 9009.

Phone number 450 6009.

Phone number 453 9006.