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উত্তরটা বাংলায় চাইলে মন্তব্যে জানাবেন, প্রশ্ন ইংরেজিতে করায় আমিও ইংরেজিতেই উত্তর দিচ্ছি।
Let's guess the total number of the members was 'x'.
So the amount of the raised money was 85x.
After Jean had joined, the number of the members became x+1 and the amount turned into 85x+50.
Now according to the condition,
(85x+50) / x+1 = 80
or, 85x + 50 = 80x + 80
or, 5x = 30
or, x = 6
That means before Jean had joined, there was 6 members in that club.
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