Answer: D) 50
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Step-by-step explanation:
There are 60 questions total.
Amita made 40 questions, but only 50% were considered "good" to be used. So that means 0.50*40 = 20 questions were used.
This means 60-20 = 40 questions remain, and this must be the amount of "good" questions that Meena provided.
We're told that 80% of Meena's questions were considered "good". Let x be the total number of questions she provided.
80% of x = (number of "good" questions Meena offered)
0.80x = 40
x = 40/0.80
x = 50
Therefore, Meena wrote up 50 questions.