For a scientific experiment a physicist must make sure that the temperature of a metal does not get colder than -100c or the metal will not be useable. The physicists changes the metal's temperature at a steady rate of -5c per hour

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups