Question

find the number of cubical of side 5 cm can kept in a big box whose dimensions are 6 m and 3 m respectively​

Answer 1

your answer is here
volume of cuboid
$= l \times b \times h$
$6 \times 4 \times 3 = 72m \: cube$
number of cuboid for 5 boxes is
$72 \times 5 = 360cm$
change it into metre
$360 \div 100 = 3.6m$