A ration of 20 to 10 means that one number is twice as large as the other. So, we have

x and we have 2x.

x + 2x = 300

3x = 300

x = 100

The other number is 2x; 2 * 100 = 200 < The answer

100 + 200 = 300

x+y=300

x/y=20/10

10x=20y

x=2y

Substituting

2y+y=300

3y=300

y=100

x=2*100

x=200

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