Of the 60 girls at a summer camp, 75 percent chose to learn rowing

Question

Of the 60 girls at a summer camp, 75 percent chose to learn rowing and 25 percent chose to learn archery. How many of the camp's girls chose to learn rowing but not archery?

(1) 15 of the girls at the camp chose to learn archery but not rowing.

(2) None of the girls at the camp chose to learn neither rowing nor archery.

stne · Answer

This is what we can already ascertain from the question: GMAT 1.2.jpg (1) 15 of the girls at the camp chose to learn archery but not rowing. GMAT 1 .1.jpg Thus we see that rowing and not archery is 45. SUFF. (2) None of the girls at the camp chose to learn neither rowing nor archery. GMAT 1.3.jpg Here again we can see that rowing and not archery is 45. SUFF. Hope it helped.

KushagraKirtiman · Answer

Wrong, the 75% and 25% can include intersections. S-2 just tells us that the all girls atleast one of the games. How can we conclude from that if the intersection would be zero

Bunuel · Answer

From the stem:
 
{Total} = {Rowing} + {Archery} - {Both} + {Neither}
60 = 45 + 15 - {Both} + {Neither}
{Both} = {Neither}
 
The question asks to find {Rowing} - {Both}

From (2): 
 
{Neither} = 0
 
Thus {Both} = {Neither} = 0, and {Rowing} - {Both} = 45 - 0 = 45.

P.S. You should read the question and provided solution more carefully and avoid jumping to conclusions too quickly.

KushagraKirtiman · Answer

Thanks, understood

bumpbot · Answer

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Of the 60 girls at a summer camp, 75 percent chose to learn rowing

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