or
or
Students answer Q.1 or Q.2 or both correctly = ( 100 - 20) = 80%
Let, x% students answered both correctly
( 75 - x) + ( 55 - x) + x = 80
130 - x = 80
x = 50
আপনি আমাকে যেকোনো প্রশ্ন করতে পারেন, যেমনঃ
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