Divide the sum of 5/21 and 4/7 by their difference
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Step-by-step explanation:
Sum of 5 by 21 and 4 by 7
=5/21 +4/7
=1(5)+3(4)
=5+12/21
=17/21
Difference of 5 by 21 and 4 by 7
=4/7-5/21
=3(4)-1(5)
=12-5/21
=7/21
Now dividing the sum of of 5 by 21 and 4 by 7 by their difference
=17/21÷7/21
=17/21×21/7
=17/7
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