exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Solve the following matrix
[ 2 8 22 ]
[ 4 1 14 ]
I think you need to multiply the top by negative 2 and then subtract from the bottom. but I am confused from there. 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 ?