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astultz309459
12.03.2020 •
Mathematics
The average length of time that three lawn-service mowers operate on a given day is 930 minutes. None of the mowers operates for less than 900 minutes. What is the greatest possible length of time any of the mowers operates?A. 990
B. 950
C. 960
D. 900
E. 930
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Ответ:
The answer is A. 990.
Step-by-step explanation:
Now, to find the greatest possible length of time any of the mowers operates.
The 3 lawn-service mowers operate at the average length of time = 930 minutes.
So, the total length of time the 3 lawn mowers take =![930\times 30=2790\ minutes.](/tpl/images/0543/8214/5b115.png)
The least length a mowers operates = 900 minutes.
Now, to find the greatest possible length of time any of the mowers operates:
Let
be the greatest possible length of time any of the mowers operates.
As, any one of the mowers operates greatest length.
So, rest of the two mowers be least at length.
According to question:
Subtracting both sides by 1800 we get:
Thus, the greatest possible length of time any of the mowers operates is 990 minutes.
Therefore, the answer is A. 990.
Ответ:
The relationship between density, mass, and volume is expressed mathematically as:
ρ = m / v
Where,
ρ = density
m = mass
v = volume
To find for mass or weight, we rewrite the equation in terms of m:
m = ρ v
m = (0.492 g / mL) * 163.5 mL
m = 80.442 g
m = 80.44 g