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MariettaO [177]
3 years ago
15

there is enough grass to feed 6 cows for 3 days. how long would the same amount of grass feed 9 cows?

Mathematics
1 answer:
brilliants [131]3 years ago
4 0

Answer:

4 1/2 days

Step-by-step explanation:

<u>cows |   6    |    9</u>

<u>days  |   3    |   </u><u>  x</u>

6 divided by 2 is 3

9 divided by 2 is 4.5

x = 4 1/2 days

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A bag contains 8 yellow marbles and 6 blue. What number of yellow marbles can you add to the bag so that the ratio of yellow to
Kazeer [188]
8 : 6 ...add 7 yellow and it becomes 15:6 when reduced = 5:2
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3 years ago
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The mean of a set of eight numbers is 8 and the mean of a different set of twelve numbers is m. Given that the mean if the combi
Basile [38]
Mean=total/the number of values =>total=mean*the number of values
the total of the first set of 8 numbers is : total=8*8=64
the total of the second set of 12 numbers is: 12m
the total of the 20 numbers is: 64+12m
the mean of the 20 number is: (64+12m)/20=5
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3 years ago
M &lt;2=x+94 what does x equal
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6 0
3 years ago
A village was founded four hundred years ago by a group of 20 people. In this village, the population triples every one hundred
Paha777 [63]

Answer:

Step-by-step explanation:

Treat this like compound interest:  Use A = P(1 + r)^t.

Here, P is the initial population and A is 3 times that, or 3P.  Since P = 20 people, 3P = 60 people,

and this population is reached after 100 years.

We need to determine r, substitute its value into the formula A = P(1 + r)^t, and then determine the population of the village after 400 years.

60 = 20(1 + r)^100

Simplifying, 3 = (1 + r)^100.

Taking the natural log of both sides,

ln 3 = 100 ln (1 + r), or

                   ln 3

ln (1 + r) = ---------------

                    100

              = 1.0986 / 100 = 0.01986

We must solve this for r.  Raising e to the power ln (1 + r), on the left side of an equation, and raising e to the power 0. 01986 on the right side, we get:

1 + r = 3, so r must = 2.

Now find the pop of the village today.  Use the same equation:  A = P (1+r)^t.

A = 20(1 +2)^4 (hundreds),

or

A = 20(3)^4, or

A = 81

The population after 400 years is 81.

8 0
3 years ago
How to figure it out
ollegr [7]
Y = kx
72 = k*3
73/3 = k
24 = k

y = 24x

4 0
3 years ago
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