0.123 bar is equal to ........
(a) 122/990
(b) 122/100
(c) 122/99
(d) 122/1000

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Solution

Let,
x=0.123 eqn 1
10x=1.23 eqn 2
100x=12.3 eqn 3
1000x=123 eqn 4
All our option contains 122.so obtain 122,
eqn 4 - eqn 2
1000x-10x=123-1.23 =122(nearly)
990x=122
x=122/990=0.123

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