Solutions to I-Practice Math #1
1. The surface area of a tank 120 feet in diameter and 14 feet deep is ________ square feet.
120 ft x 120 ft x 0.785 = 11,304 square feet
or
60 ft x 60 ft x 3.14 = 11,304 square feet
2. The surface area of a tank 90 feet in diameter and 9 feet deep is _____ square feet.
90 ft x 90 ft x 0.785 = 6,358.5 square feet
or
45 ft x 45 ft x 3.14 = 6,358.5 square feet
3. The cross-sectional area of a tank 100 ft long, 25 ft wide, and 12 ft deep is _____ square feet.
25 ft x 12 ft = 300 square feet
4. The surface area of a tank 100 feet long, 25 feet wide, and 12 feet deep is _____ square feet.
100 ft x 25 ft = 2,500 square feet
5. A lot that measures 1,200 feet by 2,500 feet contains ______ acres.
(1,200 ft x 2,500 ft) / 43,560 square feet / acre = 68.87 acres
6. The strength of a chemical solution made with 6 pounds of chemical and 55 gallons of water is _____ %.
6 lbs/(55 gal x 8.34 lbs/gal) x 100% = 1.31%
7. 200 gallons of a 2.5% solution contains _____ pounds of chemical.
200 gal x 8.34 lbs/gal x (2.5%/100%) = 41.7 lbs
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