111. The average of 50 numbers is 38. If the numbers 45 and 55 are discarded, then the average of the remaining numbers is-
112. Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56, then difference of first and third numbers is
113. The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3 : 5 : 7, the price of the cheapest item is-
114. A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.
115. The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of all the 30 observations is-
116. In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class 13 years. What is the average age of the whole class (rounded to two digits after decimal) ?
117. The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of agricultural workers is 11 times that of other workers. Then the average monthly income (in Rs.) of all the workers is-
118. The average mark of student in 4 subjects is 75. If the student obtained 80 marks in the fifth subject, then the new average is-
119. The average of 7 consecutive numbers is 20. The largest of these numbers is-
120. Of four numbers whose average is 60, the first is one-fourth of the sum of the last three. The first number is -
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