Preciso saber qual o valor da variável (y)

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost