exam Maths Puzzle Numerical Ability

You have two stacks of coins. One stack is 15inches tall, the other is 9 inches tall. All the coins are the same thickness, what is the thickness of the coins?
(15/x)+(9/x)=24 ?

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exam Other Question

A survey of 700 people was conducted. Forty percent of the men surveyed supported the issue in question, while 70 percent of the women supported it. A total of 400 supported the issue. How many more women than men were surveyed? Solve and check answer
1/3x-1 - 2/6x^2+13x-5 = 3/2x+5