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This is cool 2 10s are 20, half of 4 is 2. The trick is to take one of the 2s off one of the tens then add the other 2 to the other 10. 10-2=8 and 10+2=12 Now 8+12 = 20 and the difference is 4

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Q: What is the sum of two numbers is twenty their difference is 4?
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