exam Maths Puzzle Numerical Ability

Divide a^3 b^4 c^6 by a^4 b^2, then divide that by a^2 b^3 d The posted answer is c divided by a^3 b d. How was that obtained. Can you "spell" out the thinking and process that led to that answer?

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exam Other Question

This subject is realy hard for me,

(3a+6)x + y = a
(a*+ a-2)x-y = 2

it says in the book that i have to find out:

1-one answer only
2-there is no answer
3-there is no en Please help me to understand how to do this...it doesn`t make sense to me. Thank you so very much in advance for helping me. Here is the problem:

3^w * 3^5-w * 3

Thank