A disease has infected an ant colony that consists of "workers" and "soldiers": 30% of the soldiers and 14% of the "workers" were infected. If that colony is inhabited by 7000 ants, out of which 1700 are infected, how many "workers" inhabit the colony?  Options.
A) 1500	B) 2500	C) 2750	D) 3000	E) 3250
From two question we get wo equations:   (1) 0,3s + 0,14w = 1700   (2) s + w = 7000   From (2) we get w=7000-s   In (1) 0,3s + 980-0,14s= 1700   0,16s=720   72000:16= 4500 =s   In (2) 4500 + w = 7000   w= 2500   ANSWER:2500
<result>B</result>
A disease has infected an ant colony that consists of "workers" and "soldiers": 30% of the soldiers and 14% of the "workers" were infected. If that colony is inhabited by 7000 ants, out of which 1700 are infected, how many "workers" inhabit the colony?