# The sum of two number is 15. twice one number equals 3 times the other. Find the numbers?

### 6 Answers

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- electron1Lv 74 weeks ago
Let the numbers be x and y.

x + y = 15

2 * x = 3 * y

x = 1.5 * y

Use this for x in the first equation.

1.5 * y + y = 15

2.5 * y = 15

y = 6

x + y = 15

x = 9

Check:

2 * 9 = 3 * 6

18 = 18

I hope this is helpful for you.

- KrishnamurthyLv 74 weeks ago
Let x and y be the two numbers.

x + y = 15

2x + 2y = 30

2x - 3y = 0

5y = 30

y = 6

x = 9

The two numbers are 6 and 9.

- mizooLv 74 weeks ago
Let the numbers a and b.

2a = 3b => a = (3/2)b

a + b = 15

(3/2)b + b = 15

(5/2) b = 15

b = 15 * 2/5

b = 6

a + b = 15 => a + 6 = 15

a = 9

The numbers are 6 and 15.

- L. E. GantLv 74 weeks ago
x+ y = 15

2x = 3y

so

2x + 2y = 30

==> 3y + 2y = 30

==> 5y = 30

==> y = 6

hence x = 9

2*9 = 18

3*6 = 18

so 2*9 = 3*6

so the numbers are 6 and 9

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- Ted PackLv 74 weeks ago
9 and 6.

Start with 8 and 7. They are not it. Add one to the 8, subtract 1 from the 7. Bingo!

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Yes, sure. Thanks for correcting me.