Help me wiith thi will rate brainlitest

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose