In 2005, 25 percent of the math departments 40 students were female

Question

In 2005, 25 percent of the math department’s 40 students were female,
and in 2007, 40 percent of the math department’s 65 students were female.

Year Female Male Total
2005 10 30 40
2007 26 39 65

%increase = (26-10) * 100 / 10 = 160% Hence E.

A) 15%
B) 50%
C) 62.5%
D) 115%
E) 160%

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Purnank · Answer

In 2005, 25 percent of the math department’s 40 students were female,
and in 2007, 40 percent of the math department’s 65 students were female.

Year      Female    Male  Total
2005         10         30      40
2007         26         39      65

%increase = (26-10) * 100 / 10 = 160% Hence E.

Shwarma · Answer

2005- 10 girls
2007- 26 girls 
% increase= ((26-10)/10)*100 = 160%

PranavVyas · Answer

IMO E

In 2005, 25% of 40=10
In 2007, 40% of 65=26

Therefore; % Increase =difference/Initial *100
= (26-10)16/10*100
= 160%

In 2005, 25 percent of the math departments 40 students were female

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In 2005, 25 percent of the math departments 40 students were female

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards