From there we can then multiply 17 by 2 and 3 and learn that there are 34 zombies and 51 humans respectively. Double the number you have thought. Add 6 with the getting result.
This fast math trick for instant calculation will have you correctly answerin.
Since we know that there are two zombies for every three humans and that 2 3 5 we can divide 85 by 5 to figure out that in total there are 17 groups of humans and zombies. From 2nd Equation C - D 6. Then there are the problems that make you feel like a math whiz when. The second solution involves multiplying the second number of the equation by the number you are adding to it.