Question

how many matchstick of size 6 cm×4.5cm×2cm are required by a child to make a wall of size 18 cm×18cm ×20 cm?

Answer 1

43.5 matchbox are require
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Answer 2

let the no. of sticks required be x
vilume of one stick= 6×4.5×3=81cm^3
(v2) volume of sticks required=81x cm ^3
(v1)volume of wall = 18×18×20=6480cm^4

v1=v2
81x = 6480
x= 6480/8
x= 80

..so.. 80 sticks are required......