In the lab, Melissa has two solutions that contain alcohol and is m...

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In the lab, Melissa has two solutions that contain alcohol and is mixing them with each other. Solution A is 7% alcohol and Solution B is 2% alcohol. She uses 300 milliliters of Solution A. How many milliliters of Solution B does she use, if the resulting mixture is a 5% alcohol solution? Number of milliliters of Solution B: X 5 ? The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 40 minutes of calls is $16.76 and the monthly cost for 78 minutes is $21.32. What is the monthly cost for 60 minutes of calls? Monthly cost (in dollars) $ X 5 ? Calling time (in minutes) ) Suppose that there are two types of tickets to a show: advance and same-day. Advance tickets cost $35 and same-day tickets cost $20. For one performance, there were 65 tickets sold in all, and the total amount paid for them was $1675. How many tickets of each type were sold? Number of advance tickets sold: X 5 ? Number of same-day tickets sold: A fruit company delivers its fruit in two types of boxes: large and small. A delivery of 3 large boxes and 5 small boxes has a total weight of 125 kilograms. A delivery of 9 large boxes and 7 small boxes has a total weight of 265 kilograms. How much does each type of box weigh? Weight of each large box: kilogram(s) X 5 ? Weight of each small box: kilogram(s) A child is running on a moving sidewalk in an airport. When he runs against the sidewalk's motion, he travels 24 ft in 8 seconds. When he runs with the sidewalk's motion, he travels 143 ft in 13 seconds. What is the rate of the child on a still sidewalk and what is the rate of the moving sidewalk? Rate of the child on a still sidewalk: ft/sec X ? Rate of the moving sidewalk: ft/sec

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