100% = 100/100
350% = 350/100 = 35/10 = 7/2
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150 ml ethanol to 350 ml distilled water
There's no such thing as a common factor of one number. The word "common" means "same for both". You need at least two numbers, in order to find a factor that's "common" to both of them.
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The HCF is: 25
1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350