The left and right page numbers of an open book are two consecutive integers whose sum is 385. find these page numbers.

Consecutive integers are integers that follow one another. For example, 2,3,4,5,etc are consecutive integers

So algebraically, consecutive integers follow the form x, x+1, x+2, etc...

Since the sum of two consecutive integers is 239, this means:

x%2Bx%2B1=239

2x%2B1=239 Combine like terms on the left side

2x=239-1Subtract 1 from both sides

2x=238 Combine like terms on the right side

x=%28238%29%2F%282%29 Divide both sides by 2 to isolate x

x=119 Divide

So our first number is x=119

So to find the next number, simply add 1 to it to get 119%2B1=120

So our two page numbers are 119 and 120

$18.25 ($365 divided by 20)