Something Amazing

Have a friend select a page in a book, choose a word in any one of the first nine lines and in the first nine words of that line. tell him you can find the word chosen.

Ask him to multiply the number of the page by 2, and then by 5; then to add 20; next add the number of the line, add 5 to that sum, and multiply by 10; finally to add the number of the word in the line, and to give you the result. From the number he gives you subtract 250, in your mind, and you can open the book to the page of the line and show him the word he selected.

Example:
For page 124, 1st line, 7th word

124*2=248
248*5=1240+20=1260
1260+1=1261+5=1266
1266*10=12660+7=12667
12667-250=12417