SAT Mathematics Practice Test 6

Question : 7 of 58

Marks: +1, -0

A bricklayer uses the formula

n =7lh

to estimate the number of bricks,

n

, needed to build a wall that is

l

feet long and h feet high. Which of them following correctly expresses

l

in terms of

n

and

h

$l=7/{nh}$
$l=h/{7n}$
$l=n/{7h}$
$l=n/{7+h}$

Validate

Solution:

By properties of multiplication, the formula

n=7lh

can be rewritten as

n=(7h)l

.To solve for

l

in terms of n and h, divide both sides of the equation by the factor

7h.

Solving this equation for

l

gives $l=n/{7h}.Choices A, B, and D are incorrect and may result from algebraic errors when rewriting the given equation.
Choices A, B, and D are incorrect and may result from algebraic errors when rewriting the given equation.

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