SAT Math Problem

This is an SAT problem from SAT Prep Plan (www.satprepplan.com). Does it make sense?

3) The probability of picking a red marble out of a bag without looking is 1 in 5. The probability of picking out a blue marble is 11 in 25. The bag contains only red, white, and blue marbles. Which value could be the number of white marbles?

(a) 7
(b) 9
(c) 11
(d) 12
(e) 15

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6 Comments on “SAT Math Problem”

Vinod Patel Says:

June 19, 2006 at 6:39 pm
P(RED)= 1/5 = 5/25
P(Blue)= 11/25
P(white) 13/25
White has to be 13
This is the correct solution

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Vinod Patel Says:

June 19, 2006 at 6:40 pm
The problem stated is incorrect the answer has to be 13

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SAT Prep Plan Says:

June 20, 2006 at 8:06 am
Almost Vinod
P(RED) = 5/25
P(Blue) = 11/25
P(Red) + P(Blue) = 16/25, so there are 9 left (25-16)
P(white) = 9

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Vinod Patel Says:

July 9, 2006 at 10:52 pm
I am very sorry I was wrong I miscalculated the simple substraction. P(White) = 9/25 and not P(white)=9 as stated by the SAT Prep Plan says:

I got you too.

The probability can not be greater than 1. You know that

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Vinod Patel Says:

July 9, 2006 at 10:54 pm
P(white) = 9/25
the number of marbles is nine

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waphou Says:

April 1, 2008 at 7:02 am
i am right is 9

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