a total of 25 board are stack at the top of each other the thickness of each board is 2 whole 3 upon 4 cm how high is the stack
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2whole 3/4 =11/4
total height =11/4 *25
=275/4
= 68.75 cm
total height =11/4 *25
=275/4
= 68.75 cm
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