Jack received w emails in the morning, x emails in the afternoon and y emails in the evening. How many more emails did Jack receive in the afternoon than in the evening?
1. Jack received w emails in the morning, x emails in the afternoon and y emails in the evening.
2. Jack received 10 emails in the morning, 5 emails in the afternoon and 4 emails in the evening.
3. Jack received more emails in the afternoon than in the evening by 1.