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Andrew [12]
2 years ago
14

Pages in a book are numbered from 1 to 1001. How many of these page numbers include the digit 7?

Mathematics
2 answers:
Pie2 years ago
6 0

Answer:

100

Step-by-step explanation:

one digit number=7 (1 page)

two digit numbers=17,27,37,47,67,77,87,97(9)

three digit numbers=

107,117,127,137,147,157,167,177,187,197 (10)

207,217,.................................,277,287,297 (10)

307,317,..................................,377,387,397 (10)

404,..........................................477,487,497 (10)

507,...................................................................(10)

607,....................................................................(10)

707,717,727,737,747,757,767,777,787,797 (10)

807,..............................................................,897 (10)

907,..............................................................,997 (10)

total number of pages=1+9+9(10)=10+90=100

Brilliant_brown [7]2 years ago
6 0

Answer:

Hello :)

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

We can let r and b represent the numbers of teams in the red and blue divisions, respectively. The total number of goals scored in each division will be the average for that division times the number of teams in that division.

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  4.5r +4.2b = 48 . . . . . . total goals scored per week

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Solving by substitution, we have ...

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  8.7b +4.5 = 48 . . . . . . . . simplify

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  b = 43.5/8.7 = 5 . . . . . divide by 8.7

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_____

<em>Additional comment</em>

The basic idea is that you make an equation for each relation given in the problem statement. For a problem like this, you do need to have an understanding of how the average number of goals would be calculated and how that relates to the total goals.

8 0
2 years ago
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When you do so, you'll have the answer as -3 and 9
7 0
3 years ago
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Ainat [17]
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7 0
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anastassius [24]
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