1. LCM of first 100 natural numbers is N. What is the LCM of first 105 natural numbers ? (b)
(a) 5! × N
(b) 10403 N
(c) 105N/103
(d) 4N
2. Statistics show that 20% of smokers get lung cancer and 80% of lung cancer patients are smokers. If 30% of the population smokes, then the percentage of population having lung cancer is (d)
(a) 4
(b) 3
(c) 8
(d) 7.5
3. In solution of sugar and water the ratio of sugar and water by weight is 1: 4. This solution is heated and in the process it loses 50% weight. What is the ratio of weight of sugar and water in the final mixture ? (c)
(a) 4:1
(b) 2:1
(c) 2:3
(d) 3.5:2
4. A cloth store is offering “Buy 3, get 1 free.” What is the net percentage discount being offered by the store ? (a)
(a) 25%
(b) 20%
(c) 33.33%
(d) 30%
5. A milkman mixes 20 litres of water with 80 litres of milk. After selling one-fourth of this mixture, he adds water to replenish the quantity that he had sold. What is the current proportion of water to milk ? (a)
(a)2:3
(b)3:2
(c)2:1
(d)3:4