How do you solve #\frac{21}{35} = \frac{18}{v + 8}#?

1 Answer
Lil Del
Oct 9, 2016

#v = 22#

Explanation:

This is a proportion, which is solved by cross-multiplying to create a basic equation.

#21/35 = 18/(v + 8#
#21(v + 8) = 35(18)#
#21v + 168 = 630#

Now, use inverse operations to solve the equation.

#21v + 168 - 168 = 630 - 168#
#21v = 462#
#21v/21 = 462/21#
#v = 22#

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