120:150
This is a ratio.
To simplify, first divide both sides by '10'
Hence
12:15
Divide both sides by '3'.
4:5 This is the simplest ratio.
Mathematically it is written as
120:150::4:5
NB Note the use of colons and the double colon.
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C'est simple il suffit juste de diviser l'opération par 10
Démonstration: 120:150=12:15