1.

Find a two digit number which is 3 times the sum of its digit

Answer»

Answer:

two DIGIT NUMBER = 10X + y

=> 3(x+y) = 10x+y

=> 3x + 3y = 10 x + y

=> 7x = 2y

=> x/ y = 2/7

=> x = 2 and y= 7

=> two digit number = 27



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