RRB NTPC · Question 46
Direction: Answers to the following questions are based on the details given below: In a city with 120 families, 93 families use biogas, 63 use LPG gas, 45 use wood, 45 use biogas and LPG gas, 24 use LPG of gas and wood and 27 of families use wood and biogas for cooking. How many families do not use any of these three? A. 2 B. 5 C. 1 D. 0
Show answer & explanation
Answer: (A) D
Explanation
The three fuels together account for 93 + 63 + 45 − 45 − 24 − 27 + 15 = 120 families, i.e. all of them, so none uses none.