Rahul attempted 9/10 of the total number of questions in an examination .if 3/8 of the answers were wrong , what fraction of the attempted questions did he answer correctly
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Step-by-step explanation:
total number of question= 9/10
number of wrong answer= 3/8
number of correct answer= 9/10-3/8
LCM of 10 and 8= 40
9/10= 9×4/10×4= 36/40; 3/8= 3×5/8×5= 15/40
our new fraction are: 36/40 & 15/40
there for, 36-15/40= 21/40 ans
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