How do you solve $8/12=r/(r+1)$ ?

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Answer 1 · 2016-09-15T06:49:23

Cross multiply, then solve as usual.

Cross multiply.

$8(r+1)=12r$

Expand the left-hand side.

$8r+8=12r$

Subract $8r$ from both sides.

$8=12r-8r$

Simplify.

$8=4r$

Divide both sides by $4$ .

$8/4=r$

Simplify.

$2=r$

Switch sides.

$r=2$

Answer 2 · 2016-09-15T06:49:29

$r=2$

$8/12=r/(r+1)$
$=> 2/3=r/(r+1)$

$=>3r=2(r+1)$
$=> 3r=2r+2$
$=> r=2$

How do you solve 8/12=r/(r+1)8/12=r/(r+1)?