And the answer is.......

Are you serious?

This is a 100% complicated question, isn't it?

(25% ÷ 42%) = the percentage of those who passed the first test who also passed the second.

P=(probability of something)
A=students that passed first test
B=students that passed both tests

So, using conditional probability,

P(A and B) = P(A)*P(B/A)
Divide both sides by P(A)
P(A and B)/P(A)=P(A)*P(B/A)/P(A)
Cancel **** out
P(A and B)/P(A)=P(B/A)
Commute that ****
P(B/A)=P(A and B)/P(A)

So, figure that **** out... 60%

bingo...

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How come I don't get a bingo? 25% ÷ 42% = 59.52%.

Sheesh, I handed you the answer. Don't you want to do at least part of your homework yourself?

Tough crowd in tonite.

my ap0logies to you...you get a "bingo" too.......

A million percent, sorry a billion, (typo.)

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Thank you. I feel much better now.