Question 729309
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tens digit = ones digit + 4
tens digit + ones digit = 12
ones digit + 4 + ones digit = 12
(ones digit + ones digit) + 4 = 12
(ones digit + ones digit) = 12 - 4
(ones digit + ones digit) = 8
2 X (ones digit) = 8
ones digit = 8 ÷ 2
ones digit = 4
tens digit = ones digit + 4 = 4 + 4 = 8