How do you solve $\frac{6}{a + 18} = \frac{2}{5}$ $\frac { 6} { a+ 18} = \frac { 2} { 5}$ ?

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Answer 1 · 2016-11-23T01:57:00

$\frac{6}{a + 18} = \frac{2}{5}$ $frac{6}{a+18}=2/5$

Cross multiply:
$(2) (a + 18) = (5) (6)$ $(2)(a+18)=(5)(6)$

Divide each side by 2:
$a + 18 = \frac{5 \cdot 6}{2}$ $a+18=(5*6)/2$
$a + 18 = 15$ $a+18=15$

Subtract 18 from each side:
$a = - 3$ $a=-3$

How do you solve 6a+18=25\frac { 6} { a+ 18} = \frac { 2} { 5}?