Solve the equations. (Check your answers.)
95. A soft drink is made by mixing 4 parts of carbonated water with every 3 parts of syrup. How many milliliters of carbonated water are in 280 ml of soft drink?
96. The ratio of graduate students to undergraduates at a certain university is 8 to 5. If there are 9880 undergraduates at the university, how many graduate students are there?
Solve the formula for the given variable.
97. for .
99. Crystal Lake is 6 miles wide. The total time it took Helena to Kayak back and forth across the lake was 2 hours. Her rate kayaking back was three times her rate going out across the lake. What was Helena’s rate kayaking back across the lake?
Out across the lake
Back across the lake
Set up the equation and solve it.