For a fraction, the numerator minus 1 equals 1 / 3; the denominator minus 1 equals 1 / 2. What's the number? Primary school mathematics book 10 thinking questions
Let the numerator be x, the denominator be (x-1) * 3 = 3x-3, 2x = 3x-3-1, x = 4, and the number is 4 / 9