help me pleaseee asappp solving systems of equations

Someone answer this check out the image!

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.

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.