book Maths Puzzle Numerical Ability

51/4% of what is 21?

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book Other Question

A number is a decreasing number if it has two or more digits and each digit is less than the digit to its left. For example 754 and 620 are decreasing numbers, but 756 and 6220 are not decreasing numbers. How many decreasing numbers are there? A rectangle has a perimeter of 46 meters. The area is 124 meters squared. Find the dimensions...thank you!