Arithmetical Operations
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11 In a class of students, if 1 is absent rest of people can be divided into 6 equal parts and if 2 are absent rest of them are divided into 7 equal parts, how many students are present in the class ?
12 A group of 1200 persons consisting of captains and soldiers is travelling in a train. Forevery 15 soldiers there is one captain. The number of captains in the group is
13 A is 3 years older to B and 3 years younger to C, while B and D are twins. How many years older is C to D?
14 The 30 members of a club decided to play a badminton singles tournament. Every time a member loses a game he is out of the tournament. There are no ties. What is the minimum number of matches that must be played to determine the winner ?
15 A worker may claim Rs 15 for each km which he travels by taxi and Rs 5 for each km which he drives his own car. If in one week he claimed Rs 500 for travelling 80 km how many kms did he travel by taxi ?
16 Ayush was born two years after his father's marriage. His mother is five years younger than his father but 20 years older than Ayush who is 10 years old. At what age did the father get married ?
17 In a family, each daughter has the same number of brothers as she has sisters and each son has twice as many sisters as he has brothers. How many sons are there in the family ?
18 The sum of the interior angles of a polygon is twice the sum of its exterior angles. How many sides does the polygon have ?