/sci/ - Science & Math

Anonymous Wed Jan 30 11:55:29 2019 No.10341927 [View]
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>>10341908
The easiest way I do it is cross multiplication. SO we place what ever percentage over 100 and if dont know it we put a X. We then place the number which is the percentage over the number we are basing as 100%. So in your example we could find 35% of 90 by doing 35/100 is equal to x/90 and then cross multiply and solve for X. In the second example just place 7/100 and 120/x.

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/sci/ - Science & Math

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