Let the number of boards be n.
Since each of them is
[tex] \frac{1}{12} [/tex]
meter thick,
All the n boards will be,
[tex] \frac{1}{12} \times n[/tex]
meters thick or high.
Since all the board is 2 meters high, it means,
[tex] \frac{1}{12} n = 2[/tex]
Multiplying through by 12,
n = 2×12
n = 24.
There are 24 boards in the stack.
Alternatively,
Since each board is
[tex] \frac{1}{12} [/tex]
meters thick, the number of boards that will be 2 meters high is ;
[tex] \frac{2}{ \frac{1}{12} } [/tex]
This is
[tex] = 2 \times \frac{12}{1} [/tex]
[tex] = 24[/tex]
