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Decimal Fraction - General Aptitude

Q1:

Which of the following are in descending order of their value ?

A
1 , 2 , 3 , 4 , 5 , 6
3 5 7 5 6 7

B
1 , 2 , 3 , 4 , 5 , 6
3 5 5 7 6 7

C
1 , 2 , 3 , 4 , 5 , 6
3 5 5 6 7 7

D
6 , 5 , 4 , 3 , 2 , 1
7 6 5 7 5 3

ANS:D -

6 , 5 , 4 , 3 , 2 , 1
7 6 5 7 5 3

Make denominator same;
= 6*30/7*30, 5*35/6*35, 4*42/5*42, 3*30/7*30, 2*42/5*42, 1*70/3*70.
= 180/210 ,175/210 ,168/210 ,90/210 ,84/210 ,70/210.
Arrange the numerator in descending order.