Hot Dogs

How many hot dogs did this hot dog lover eat on the first day of her binge?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative
A hot dog lover ate 60 hot dogs over an 8-day period.

Every day, she ate one more hot dog than she had eaten the day before.

How many hot dogs did she eat on the first day?

This problem is adapted from the World Mathematics Championships