The length and breadth of a rectangular field are in the ratio 5:4 if the perimeter is 90m find its area?
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Irrational means it cannot be written as a fraction of two integers.
1/6 is a fraction, so that's out.
0.060606... can be written as a fraction because it's a repeating decimal, so that's out.
and 7 can be writen as the fraction 7/1, so that's out.
The answer is .