• 5:3:12=720 5+3+12=20 720/20=36 36x5=180 36x3=108 36x12=432 432+108+180=720 RED=180 YELLOW=108 WHITE=432 180-108=72 ANSWER=B
  • 5-20-2017 Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom. Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school. So you have a ruler with 720 marks and another ruler with 5+3+12=20 marks. It takes 36 marks on the one to equal one mark on the other. So 5 parts red equals 5 x 36=180 ml, 3 parts yellow equals 3x36=108 ml, and 12 parts white equals 12x36=432 ml.

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