If 3:5:18 : x , x = ...
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Answer:
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What is the value of x in 6:5=18:x?
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Tony Ngok
Answered March 25, 2018
Of course the answer is 15.
The sign ‘:’ here is called ‘ratio’, which is roughly the same as ‘division’. (e.g. 6:5 means ‘6 divided by 5, or 6/5.) So the whole questions actually means 18/x=6/5. Now you multiple both sides of the equation by 5x (That is you multiply 18/x by 5x and you multiply 6/5 by 5x as well), then you’ll get 18*5=90=6x. Finally, x=90/6=15. Not that difficult question.
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Kacey Wagner
Answered March 22, 2018
There are three different ways to represent a ratio:
a to b
a:b
a/b
So to solve your equation, rewrite the ratios:
6:5=18:x
6/5=18/x
Then cross multiply
18*5=6*x
Divide both sides by 6
(18*5)/6=x
Simplify
x=(18/6)*5=3*5=15
x=15