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Mathematics 13 Online
OpenStudy (anonymous):

1/4+4x/5=11/20

OpenStudy (anonymous):

Multiply the whole equation through by 20 and you get 5+16x=20. 16x=15. X=15/16.

OpenStudy (anonymous):

My bad, 5+16x=11

OpenStudy (anonymous):

x=3/8

OpenStudy (anonymous):

why multiply?

OpenStudy (anonymous):

It's better than finding common denominators, which takes a long time, and since you multiply both sides of the equation by the same thing the equation remains true.

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