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Tresset [83]
3 years ago
15

There are 50 books that are either red or blue. If 30 books are blue, what

Mathematics
1 answer:
RUDIKE [14]3 years ago
5 0

Answer:

The answer is 20%

Step-by-step explanation:

20% because if there are 50 altogether and there are only 30 blue books, then there 20 more books that are red that will make the count of 50

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The tens digit of a two-digit number is five more than the units digit. Seven times the sum of the digits of this number is 3 le
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Answer:

43

Step-by-step explanation:

Let

The unit digit = x

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The number = 10x + y

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y = x + 5

Seven times the sum of the digits of this number is 3 less than the number itself.

7(x + y) = 10x + y - 3

7x + 7y = 10x + y - 3

Find the number.

We substitute x + 5 for y

7x + 7(x + 5) = 10x + (x + 5) - 3

7x + 7x + 35 = 10x + x + 5x - 3

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Collect like terms

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38 = 2x

x = 38/2

x = 19

Solving for y

y = x + 5

y = 19 + 5

y = 24

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Answer:

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