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The mean ago of 25 teachers in a schools is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place . If now the mean age of the teachers in this schools is 39 years, then the age (in years) of the newly appointed teacher is

In which of the following situations, do the lists of numbers involved form an AP? Give reasons for your answers. (i) The fee charged from a student every month by a school for the whole session, when the monthly fee is Rs. 400. (ii) The fee charged every month by a school from classes I to XII, When the monthly fee for class I is Rs. 250 and it increases by Rs. 50 for the next higher class. (iii) The amount of money in the account of Varun at the end of every year when Rs. 1000 is deposited at simple interest of 10% per annum. (iv) The number of bacteria in a certain food item after each second, when they double in every second.

IN a typical Indian Bugghi(a luxury cart drawn by horses), a wooden plate is fixed on the rear on which one person can sit. A bugghi of mass 200 kg is moving at a speed of 10 km/h. As it overtakes a school boy walking at a speed of 4 km/h,. the boy sits on the wooden plate. If the mass of the boy is 25 kg, what will be the new velocity of the bugghi?

Use Graph paper for this question. A survey regarding height ( in cm) of 60 boys belonging to Class 10 of a school was conducted. The following data was recorded. Taking 2 cm = height of 10 cm along one axis and 2 cm = 10 boys along the other axis draw an ogive of the above distribution. Use the graph to estimate the following : (i) the median

A school district is forming a committee to discuss plans for the construction of a new high school. Of those invited to join the committee, 15% are parents of students, 45% are teachers from the current high school, 25% are school and district administrators, and the remaining 6 individuals are students. How many more teachers were invited to join the committee than school and district administrators?

A school has wants to arrange hobby classes for the students of classes 6.7. and 8. The school wants each student of classes 6-8 to opt for any one of the following, Painting. Vocal Music, Volin, Tabla Dance What data needs to be collected and how the data should be organised so that the school is able to arrange these hobby classes for the students?

In a school there are 1000 students , out of which 430 girls . It is known that out of 430 , 10% of the girls study in class XII. What is the probability that a students chosen randomly studies in class XII ,given that the chosen students is a girl

In a certain collage, the ratio of mathematics majors to English majors is 3:8. If in the following school year the number of mathematics majors increase 20%, and the number of English majors decrease 15%, what is the new ratio of mathematics majors to English majors?

The percentage of attendance of different classes in a year in a school is given below: Class: X IX VIII VII VI V Attendance: 30 62 85 92 76 55 What is the probability that the class attendance is more than 75%? (a) 1/6 (b) 1/3 (c) 5/6 (d) 1/2