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five times a​ number, subtracted from eighteen​, is triple the number.

Guest Sep 5, 2017
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five times a​ number, subtracted from eighteen​, is triple the number.

 

let the number be x

Five times the number is 5x

subtract this from 18 and you get              18-5x

 

This is equal to tripple the number  tripple x is  3x

so

 

18-5x=3x

add 5x to both sides

18 = 8x

divide both sides by 8

18/8 = x

x =  9/4

x = 2.25

Melody  Sep 5, 2017
edited by Melody  Sep 5, 2017

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