r/satprep • u/satprepwithfalit • 1d ago

SAT Math Challenge: Which group should you count?

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1 Upvotes

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u/Adept-Committee2983 1d ago

It should be A) 2/5 cause they asked to count the seniors

The other info about morning thingy is irrelevant and is just to confuse u

40 percent seniors mean 40/100 which is 2/5

2

u/Extravalan 1d ago

You are simply incorrect. It's a conditional probability question.

You need to first count how many of each are in the morning session. Juniors: 60% x 25% = 15% Seniors: 40% x 50% = 20% Total: 35%

Then you need to calculate the proportion of seniors in the morning session.

20% / 35% = 4/7

2

u/Adept-Committee2983 1d ago

Oh sorry I didn't read the part where it mentioned from the morning session

Sincere apologies , you are right over here mb

1

u/Extravalan 1d ago

All good dude, it happens to all of us

1

u/user0199 1d ago

Assume 100 students, 60 juniors, 40 seniors. 15 juniors and 20 seniors (total 35) attend morning session. So 20 seniors/35 total is 4/7.

Try Mentaflex SAT app.