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661.Find the missing number in the sequence: 3, 7, 15, ______, 63, 127.
662.On a map, 1 inch represents 20 miles. The distance between two towns is 6 1/5 inches. How many miles are actually between the two towns?
663.1200 boys and 800 girls appeared in an examination. If 60% of the boys and 40% of the girls passed the examination, what is the percentage of candidates who failed in the examination?
664.A parking lot contains 160 vehicles. Each vehicle is either a car or a truck and each vehicle is either red or green. 70 vehicles are red and 120 vehicles are cars. If there are 18 green trucks, how many red cars are there?
665.The ratio of male and female students in a class is 27:23. If the difference between the number of male and female students is 200, then the number of female students is?
666.If a fruit seller buys bananas at Rs.100 per dozen and sells at Rs.140 per dozen, he earns the profit at?
667.If the cost price of an item is Rs.1200 and sold at loss of 10%, what is the selling price?
668.In a random sample of 80 records, 12 are incomplete. Using the sample proportion, how many incomplete records would be expected among 600 similar records?
669.Let A be the set of positive multiples of 2 below 12, and B the set of positive factors of 12. How many elements are in A ∩ B?
670.If the cost price of 15 items is equal to the selling price of 10 items, what is the profit or loss percentage?