For landscape maintenance Gretchen Green uses 4 pounds of fertilizer for every 200 square feet of lawn. At this rate, how many pounds of fertilizer did she use on a lawn that measures 8600 square feet? Round to the nearest whole number.

A real estate company bought a parcel of land containing 282 acres and plans to divide it into lots for homesites.  One-third of the land must be used for streets.  Each lot will require 3/8 of an acre.  How many lots can be sold from this piece of property?

A chemical cost $5.25 per gram. Waht would be the cost per ounce?

Given that a dollar bill measures 2.6 inches by 6.1 inches, how many square miles will 1 trillion dollar bills cover?

A 25 pound box of frozen peas and onions costs $1.25 per pound. How much does a 6 ounce serving cost?

How many ounces of 10% alcohol would need to be mixed with pure rubbing alcohol to get 16 ounces of a 14% alcohol mix?

A taxi driver charged $2.40 for the first kilometer and $0.30 for every 12 km of part thereof. How much will a passenger have to pay for a journey of 214 km?

A general contractor is constructing a building that requires a concrete foundation that is to be 20 ft by 12 ft and 4 in thick. How many cubic yards of concrete do you need round it to the hundredth place. If the local home supply store sells concrete for $125 per cubic yard what will be the cost of the concrete for the foundation. Rounded to the nearest whole number

The correct mixture of oil To gas in a weed eater is 1/2 pint of oil to 2 1/2 gallons of gas. How many pints of oil are needed for 20 gallons of gas

Craig owns a ready mis concrete company. Craig receives an order for 1.5 cubic yards of concrete. This mixture of concrete contains sand, cement, gravel, and water; for each pound of water, there are 5lb of sand, 2lb of cement, and 7lb of gravel. Find the total weight of the order (in pounds), assuming a cubic yeard of concrete weighs 4000 lb, and how many pounds of each ingredient must be used. answer in the back of the book is:  water: 400lb sand: 2000lb cement: 800lb gravel: 2800lb please help me set up the equations needed to solve the problem and get the answers given.