Question

The left and right page numbers of an open book are two consecutive integers whose sum is 209. Find these page numbers.

Answer 1

Left page = x

Right page = x + 1

x + (x + 1) = 209

2 x + 1 = 209

2 x = 208

x = $\frac{208}{2}$ =104

Left page = 104

Right page = 105