6 and 4,
8 and 12,
12 and 18
yes the ratios are equal (the ratio is 2:3 or 2/3)
Basically what you need to do is find a common denominator between 4 and 5. The answer would be 20. That would be the denominator. If you are multiplying 3/5 to get to twenty multiply 5x4=20. 3x4=12. You need to do the same thing to the numerator . Same for 1/4 multiply by 5. 4x5=20. 1x5=5 so, you would add 2 5/20 and 4 12/20. You would get 7 17/20 if you do it correctly :)
It depends on your personal preference. If you want to just be simplistic and use a phone for phone calls and stuff and that is it, then go with iphone. If you want a phone with more features, go with android. These are both smartphones. If you really want simple, then go with C or D.
D. if something is directly proportional then if something happens to X the exact same thing needs to happen to Y