exam Maths Puzzle Numerical Ability

How do I solve problems like this one.
Solve the equation ay/x=cz find the variable y.

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exam Other Question

Decide whether the experiment is a binomial experiment. If it is not, explain why. Each week, a lottery player plays the Daily Three in the California lottery. The random variable is the number of times per year the player wins. Can someone show me how to work this. I know the answer is 10 but how do I get that?
The GCF of 2x- 6 is 2. The GCF of 5x + 10 is 5. Find the GCF of the product (2x-6)(5x + 10).