Jack spent $40 on new shoes then he spent half of what he had left on clothes finally he gave five dollars to his brother now he has $35 how much money did jackxon have to begin with

This is a working backwards problem.  You know he has $35 at the end.  Before he gave his brother $5, he would have $40, which is half of what he had before he bought the clothes, so he would have had $80.  Before he spent the $40 on shoes, he would have had $120, so the answer is $120.