Question

How many 4inch by 8inch bricks are needed to build a walk 6 feet wide and 24 feet long

Answer 1

The number of bricks needed to build area of a walk is 648 .

Explanation:

Given as :

The dimension of bricks is 4 inches by 8 inches

The Length of bricks = L = 4 inches

The width of bricks = w = 8 inches

So, Area of bricks = Length of brick × width of brick

Or, Area of bricks = 4 × 8

I.e Area of bricks = 32 inches²

Again

The dimension of walk is 6 feet by 24 feet

The Length of walk = l = 6 feet = ( 6 × 12 ) inches

I.e Length of walk = 72 inches

The width of walk = 24 feet = ( 24 × 12 ) inches

I.e width of walk = 288 inches

So, Area of walk = Length of walk × width of walk

Or, Area of walk = 72 × 288

I.e Area of walk = 20,736 inches²

Now , Let The number of bricks needed to build walk = n

So, n =
`(\textrm Area of walk)/(\textrm Area of bricks)`

I.e n =
`(20736 inches^(2))/(32 inches^(2))`

∴ n= 648

So, number of bricks needed = n = 648

Hence The number of bricks needed to build area of a walk is 648 . Answer