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Equivalent Ratios

In 1/2a - 1...

Question

In $\frac{1}{2}$ a - 1 $\frac{1}{2}$ = 4 $\frac{1}{2}$ , the value of a is

A

0

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B

12

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C

8

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D

-12

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Solution

The correct option is B 12
$\frac{1}{2}$ a - $\frac{3}{2}$ = $\frac{9}{2}$
$\frac{1}{2}$ a = $\frac{9}{2}$ + $\frac{3}{2}$ = $\frac{12}{2}$ = 6
a = 6 x 2
a = 12

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