A team won 45% of the first 80 games played. How many of the remaining 82 games will the team have to win in order to win 50% of all games it played?

An oculist charges $30 for an eye exam, frames, and glass lenses, but $42 for an eye exam, frames, and plastic lenses. If plastic lenses cost four times as much as glass lenses, how much do glass lenses cost?

4/7 of professors are male. The ratio of tenured: untenured is 2:5. If 1/5 of male professors are tenured, what fraction of female professors are untenured?

Joe makes lemonade by mixing 2/3 of a cup of mix with 2 quarts of water. How many cups of mix would he need to mix with 11 quarts of water?

Andrew drove 100 miles at an average speed of 50 mph He then increased his speed by 20% and drove another 30 miles. What was the average speed for the entire journey?

Mindy’s average monthly salary for the first 4 months she worked was $300. What must her average salary for the next 8 months be so that her average monthly salary for the year is $350?