Answer:
The Geometric Mean of 4 and 12 is 6.9
Step-by-step explanation:
Given Numbers are 4 and 12
To find : Geometric mean of the given No.
The Geometric Mean is a type of average where we multiply the nos. together and then take a square root (for two nos), cube root (for three nos) etc.
Formula for Geometric Mean is given by,
⇒ Geometric Mean of 4 and 12 =
=
=
= 6.92820323028
= 6.9
Therefore, The Geometric Mean of 4 and 12 is 6.9
Answer: the sprinkling rate of the butler family's sprinkler is 40L per hour
the sprinkling rate of the Clark family's sprinkler is 20L per hour
Step-by-step explanation:
Let x represent the sprinkling rate of the butler family's sprinkler.
Let y represent the sprinkling rate of the Clark family's sprinkler.
The butler family's sprinklers was used for 40 hours. The Clark family's sprinkler was used for 30 hours. There was a combined total output of 2200L of water. This means that
40x + 30y = 2200 - - - - - - - - - - -1
if the sum of the two rates was 60l per hour, it means that
x + y = 60
Substituting x = 60 - y into equation 1, it becomes
40(60 - y) + 30y = 2200
2400 - 40y + 30y = 2200
- 40y + 30y = 2200 - 2400
- 10y = - 200
y = - 200/ - 10
y = 20
Substituting y = 20 into x = 60 - y, it becomes
x = 60 - 20 = 40
Answer:
64 DVDs
Step-by-step explanation:
25% = 16 DVDs
25%x 4 = 16x 4
100% = 64 DVDs