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Ilia_Sergeevich [38]
3 years ago
9

Twice the sum of 15 and a number

Mathematics
2 answers:
laiz [17]3 years ago
8 0
15 x 2 = 30 if thats what you're looking for


denis-greek [22]3 years ago
7 0
That can be expressed as, assuming x is the number, 2(x+15).
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Sum of two digit number is9.When we interchange the digits it is found that the resulting new number becomes twice the other num
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Answer:

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Step-by-step explanation:

Let the numbers be x and y

If their sum is 9, hence;

x + y = 9 ....1

When reversed

10y+x = 2(10x+y)

10y+x = 20x + 2y

10y - 2y = 20x - x

8y = 19x

y = 10x/8 ...2

Substitute equation 2 into 1;

From 1;

x+y = 9

x +(10x/8) = 9

18x/8 = 9

18x = 72

x = 72/18

x = 4

Since x+y =9

y = 9-x

y =9-4

y = 5

Hence the numbers are 4 and 5

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Step-by-step explanation:

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Answer:

Example:

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tree diagram

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