A sample poll of 100 voters reveals the following information about candidates A, B and C who are nominated for 3 different offices:
20 are in favour of candidate A,
50 are in favour of candidate B,
50 are in favour of candidate C,
10 favour both candidates A and B,
10 favour both candidates A and C,
25 favour both candidates B and C,
10 favour all three candidates.
Denote by A, B and C the events that a selected voter favours candidate A, candidate B and candidate C, respectively. Which of the following statements hold true?
(7/4×18/21)+ (51/7× 28/17) + (25/2 × 48/10) =?
60% of 250 + 14 × 10 - 210 = ?
140% of 1270 + 60% of 2085 = 1881 + ‘?’% of 287
2856 ÷ 34 = ?% of 240
154 × 7 + 480 × 5 =?% of 6956
17.5% of 400 – 24% of 150 = ?
72% of 400 – 23% of 1020 = 120% of ?
666(2/3)% of 30 - 116(2/3)% of 90 =?
I. 8x² - 74x + 165 = 0
II. 15y² - 38y + 24 = 0
12% of 450 + 16% of 1500 = ?
