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3 years ago

How many times does the digit one appear from 101 to 200

Mathematics

2 answers:

laila [671]3 years ago

3 0

118 times
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yuradex [85]3 years ago

3 0

Answer:

Step-by-step explanation:

Let's get the answer first and then we can discuss how it is done. The answer is 119.

There is a problem. The question does not state whether or not 101 is included. If it is 119 is correct. If the question is between 101 and 200 then the answer will be 117.

How was it done? A programming language was used. So it counted by brute force.

From 101 to 120 we get

101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

32 Certainly there must be a quicker way

101 = 2

102 to 109 = 1 * 8 = 8

110 to 119 = 10*2 = 20

111 has an extra 1 = 1

120 has 1

Total 32

From here it gets a bit easier.

121 2

122 - 129 8

total 10

130 1

131 2

132 - 139 8

total 11

140 to 149 11

150 to 159 11

160 to 169 11

170 to 179 11

180 to 189 11

190 to 199 11

total 7 * 11 + 32 + 10 = 119

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laila [671]

I will if you give me brainliest answer on the comment so hurry and do it

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3 years ago

Solve for x.

xz_007 [3.2K]

Answer:

$\displaystyle -2,66 ≈ x\:or\:0,66 ≈ x$

Step-by-step explanation:

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6 0

3 years ago

-50 added to three times an unknown number equals -11?

RoseWind [281]

Hello there!

An equation to model this situation is 3n - 50 = -11

The unknown number has a value of 13.

Okay, so let's start by breaking down the question - we'll use n to model the unknown number.

-50 added to three times an unknown number equals -11?

This means we are adding -50 to something else. (We can use + -50 or - 50 since they are the same thing, I'll use - 50 since it's easier to follow.)

-50 added to three times an unknown number equals -11?

This phrase can be modeled as 3n. This is what we are taking 50 from, so we can add that to the end of the equation so far.

3n - 50

-50 added to three times an unknown number equals -11?

This can means the equation equals -11. We can model it as = -11. Now, let's add it to our equation.

3n - 50 = -11

Now, solve for n.

You want to start by canceling -50 out on the left side, so n is on it's own side, and to do this you add 50 to both sides.

3n - 50 + 50 = -11 + 50

3n = 39

To finish isolating n, divide both sides of the equation by 3.

3÷3n = 39÷3

n = 13.

I hope this helps and have a great day!

7 0

3 years ago

The ratio of roosters to chickens is 2 to 8. If there are 5 roosters, how many chickens are there?

Aloiza [94]

Roosters to chickens is 2 to 8

That means where there are 2 roosters, there are 8 chickens.

Simplify the ratio 2:8
The ratio can be simplified to 1:4

So, for 1 rooster, there are 4 chickens.

Now, the question says that if there are 5 roosters, how many chickens will there be?

1 rooster to 4 chickens
5 roosters to ? chickens

We went from 1 rooster to 5 rooster. We multiplied by 5.
To find out how many chickens there are for 5 roosters, multiply 4 chickens by 5.

4 * 5 = 20

Where there are 5 roosters, there will be 20 chickens.

Another way to solve is as follows:

$\frac{2}{8} =\frac{5}{x}\\\\\sf{Cross~multiply}\\\\2x = 5\times 8\\\\2x = 40\\\\x = 20\\\\\boxed{\bf{x=20}}$

Your final answer is 20 chickens.

3 0

3 years ago

Read 2 more answers

The mean of the scores obtained by a class of students on a physics test is 42. The standard deviation is 8%. Students have to s

NemiM [27]

The correct answer is:
16%.

Explanation: 
We use a z-score to answer this question.
The formula for a z-score is:
z= $\frac{x-mue}{sigma}$ ,
where mue is the mean and sigma is the standard deviation.

Using our information, we have:
z= $\frac{50-42}{8} = \frac{8}{8} = 1$ .

Using a z-table, we see that the area to the left of, or less than, this score is 0.8413. We want to know how many students scored more than this, so we subtract from 1:
1-0.8413=0.1587, which rounds to 16%.

7 0

3 years ago

Read 2 more answers