In a village of 120 families, 93 families use firewood for cooking, 63 families use kerosene, 45 families use cooking gas, 45 families use firewood and kerosene, 24 families use kerosene and cooking gas, 27 families use cooking gas and firewood. Find how many useall?
Choose the most appropriate option:
A) 120 B) 93 C) 150 D) 15 E) 45
Let F,K and G represent the sets of students who liked rock music, folk music and classical music respectively.   F=93, K=63, G=45   F and K=45   F and G=27   K and G=24   All= 120-93-63-45+45+27+24= 
<gadget id="calculator">120-93-63-45+45+27+24</gadget>
<output>15</output>
15   ANSWER 15
<result>D</result>
In a village of 120 families, 93 families use firewood for cooking, 63 families use kerosene, 45 families use cooking gas, 45 families use firewood and kerosene, 24 families use kerosene and cooking gas, 27 families use cooking gas and firewood. Find how many useall?