设原数个位数是 x ,则十位数是 4x + 1
10(4x + 1) + x = 10x + 4x + 1 + 63
40x + 10 + x = 14x + 64
41x + 10 = 14x + 64
41x - 14x = 64 - 10
27x = 54
x = 54 ÷ 27
x = 2
所以
十位 = 4x + 1 = 9
个位 = x = 2
所以这个两位数是 92
设原数个位数是 x ,则十位数是 4x + 1
10(4x + 1) + x = 10x + 4x + 1 + 63
40x + 10 + x = 14x + 64
41x + 10 = 14x + 64
41x - 14x = 64 - 10
27x = 54
x = 54 ÷ 27
x = 2
所以
十位 = 4x + 1 = 9
个位 = x = 2
所以这个两位数是 92