Question

Dropping less than two inches per mile after emerging from the​ mountains, a river drains into the ocean. One​ day's discharge at its​ mouth, 4.5 trillion​ gallons, could supply all of country​ A's households for five months.
Based on this​ statement, determine how much water an average household uses each month. Assume that there are 100 million households in country A.

Putting Numbers in Perspective

Answer 1

Assume that there are 100 million household in country A, the amount of water an average household uses each month is 4.5*10^4. 40000 gallons per month. Below is the solution:

4.5 * 10^12 / 100 * 10^6
0.045 * 10^6  
4.5 * 10^4. 40000 gallons per month