Because quantities are equal, we average the fractions. Adding 1/10, 9/50 and 1/20 gives 33/100; dividing this sum by 3 yields a final nitrogen fraction of 11/100 or 0.11. Cbse Class 9 Maths Ganita Manjari Part 2 Solutions class 9 maths ...
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The proposition is true because square angles are 90 degrees. Its converse (“If all angles of a quadrilateral are equal, then it is a square”) is false; a rectangle provides a counterexample.