tough Q from tatamcgraw

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tough Q from tatamcgraw

by harry_x1 » Tue Jun 26, 2007 9:49 am
in a village consisting of p persons, x% can read and write. Of the males alone y%, and of the females alone z% can read and write. Find the number of males in the village interms of p,x,y and z if z<y.

(a) p(x-z)/(y+x-z)

(b) p(x-z)/(y+x-2z)

(c) p(y-z)/(x-z)

(d) p(x-z)/(y-z)

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by givemeanid » Tue Jun 26, 2007 10:14 am
Let number of males = m
Since total 'p' persons, number of females = p - m

Now, x% of p = p*x/100
Number of males who can read and write = y% of m = m*y/100
Number of females who can read and write = z% of (p-m) = (p-m)*z/100

Total number who can read and write = Number of males who can read and write + Number of females who can read and write

px/100 = my/100 + (p-m)Z/100
Solving for m: m = p(x-z)/(y-z)

The answer is (d).

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by harry_x1 » Tue Jun 26, 2007 10:42 am
thanks givemeanid.....dats correct ans