门| GATE-CS-2014-(Set-3) |第 65 题

下面的折线图绘制了五年来一所大学的男女生比例。如果2011年和2012年的女生人数相等，2012年男生与2011年男生的比例是多少?

(一) 1:1
(乙) 2:1
(C) 1.5:1
(四) 2.5:1答案： (C)
解释：

Number of female students in 2011 and 2012 are equal.
Suppose they are x.

Now,
Males students in 2011 = Female students in 2011 
                       = x (as the ratio is 1)

And in 2012, Male students / Female students = 
                                       1.5(Given)

Hence Male students in 2012 = 1.5 * Female students 
                            = 1.5 * x

Now ratio of Male students in 2012 to Male students
in 2011 = ( 1.5 * x ) / x
        = 1.5 / 1
i.e. 1.5 : 1

Hence C is the answer. 

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