Lydia received her salary on friday. she spent one-half of her salary on rent and then spent $168 on her electric and water bill. next she spent one-half of what was left on her phone bill. after spending $57.00 on gas for her car, lydia had $92.00 left. how much did lydia spend on rent?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)