s24, q19

Suyog · Posted: Fri Sep 28, 2007 1:42 pm Post subject: s24, q19

In an office, 40 percent of the workers have at least 5 years of service, and a total of 16 workers have at least 10 years of service. If 90 percent of the workers have fewer than 10 years of service, how many of the workers have at least 5 but fewer than 10 years of service?

(A) 48
(B) 64
(C) 50
(D) 144
(E) 160

can u post the formulae realted to percetage....
percent inc and percent dec and other if u all have...
Thanks!

kajcha · Posted: Fri Sep 28, 2007 2:18 pm Post subject:

suppose there are x employees

90x/100 < 10 years of exp

means 10x/100>= 10 years of exp

=> 10x/100 = 16

x = 160

40% = 64 >= 5 years

64-16 = 48 greater than 5 and less than 10