Answer:
3/400
Step-by-step explanation:
Let w represent earth's water
let f represent fresh water and let g represent ground water
[tex]f = \frac{1}{40}w[/tex]
[tex]g =\frac{3}{10}f = \frac{3}{10}(\frac{1}{40}w)\\ \\g = \frac{3}{400}w[/tex]
Therefore, fraction of earth's water,w, that is ground water = 3/400
Answer: Ground water is 3/400 of earth's water
Step-by-step explanation:
Let x represent earth's water,
F represent earth's fresh water, and
G represent earth's ground water.
The statement can then be expressed as follows:
About 1/40 of the earth's water is fresh water:
(1/40)x = F
About 3/10 of the earths fresh water is ground water:
Say: (3/10)F = G
=> (3/10)(1/40)x = G
(3/400)x = G
Therefore, ground water is 3/400 of the earth's water.
