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A bricklayer uses the formula n = 7 l h ...

A bricklayer uses the formula n = 7 l h to estimate the number of bricks, n, needed to build a wall that is l feet long and h feet high. Which of the following correctly expresses l in terms of n and h ?

A

`l=7/(nh)`

B

`l=h/(7n)`

C

`l=n/(7h)`

D

`l=n/(7+h)`

Text Solution

AI Generated Solution

The correct Answer is:
To express \( l \) in terms of \( n \) and \( h \) from the formula \( n = 7lh \), we can follow these steps: 1. **Start with the original formula**: \[ n = 7lh \] 2. **Divide both sides by 7**: \[ \frac{n}{7} = lh \] 3. **Now, divide both sides by \( h \)** (assuming \( h \neq 0 \)): \[ \frac{n}{7h} = l \] 4. **Rearranging gives us**: \[ l = \frac{n}{7h} \] Thus, the expression for \( l \) in terms of \( n \) and \( h \) is: \[ l = \frac{n}{7h} \]
To express \( l \) in terms of \( n \) and \( h \) from the formula \( n = 7lh \), we can follow these steps: 1. **Start with the original formula**: \[ n = 7lh \] 2. **Divide both sides by 7**: ...
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