Chocholate

Table of chocolate is divided into squares on its surface. Lengthwise has 15 squares and widthwise 19 squares. We must chocolate broke into individual squares.

How many times we have broke it to get only individual squares? It is not permitted to break several superposed pieces.

Correct result:

x =  284

Solution:

$x = (15-1) + (19-1)\cdot 15 = 15\cdot 19-1 = 284$

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