A website Maths Puzzle Numerical Ability

Starting with a square piece of paper which measures 20 inches by 20 inches, Calvin cuts out 5 inch by 5 inch square from each of the four corners. What is the perimeter of the resulting shape?

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A website Other Question
An ocean liner L miles from port steams toward port at 11 miles per hour. Another ship leaves the same port and steams toward the ocean liner at 1 miles per hour. How many miles away from the port will they meet? 10% of x more than xis what % less than 20% less than 20% of 2x less than 2x?