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At a track meet 2/5 of the first place finishers went to Ohio State. One half of Ohio State's first place finishers were women. If 2/9 of the first place finishers who did NOT attend Ohio State were women, what fractional part of the total number of first place finishers were men?

Respuesta :

MathPhys

Answer:

2/3

Step-by-step explanation:

The first place finishers can be divided into two groups: those who went to Ohio State, and those who did not attend Ohio State.

2/5 of the first place finishers went to Ohio State.  1/2 of these were women, which means 1/2 were men.  The fraction of first place finishers who went to Ohio State AND were men is:

1/2 (2/5) = 1/5

3/5 of the first place finishers did not attend Ohio State.  2/9 of these were women, which means 7/9 were men.  The fraction of first place finishers who did not attend Ohio State AND were men is:

7/9 (3/5) = 7/15

So the fraction of first place finishers who were men is:

1/5 + 7/15

= 3/15 + 7/15

= 10/15

= 2/3

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