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A number consists of 3 digits whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits

are reversed. The number is:


The answer is 253
explaination consider x+y+z=10
 sub y value in 2x+2z=10
                         sub in x+y+z=10
                           y=5,x+z=5,then x=2,z=3
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