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Suppose the number, when written is XY.

Then sum of digits = 10 implies that X+Y = 10

Also, 20 < XY < 32 implies that X = 2 or 3.

Suppose X = 3

Then X+Y = 10 requires Y = 7. But that is not possible because the number cannot be greater than 32.

So, X must be 2.

And then, X+Y = 10 implies that Y = 8 and so the number is 28.

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Q: Robert's numbers is between 20 and 32 the sum of the digits is 10 what is the number how do i solve it?
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