Answer:
Step-by-step explanation:
Let's say the number is called x.
So 1/3 x + 20 = 2x because 2x is the double of x.
Subtract 1/3 x from both sides: 20 = 2x - 1/3 x = 5/3 x
Multiply both sides 3, so we get 3*20 = 5x = 60,
so,
x = 12
The number is 12.
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