The average of 15 numbers is 84. The first seven numbers and the last five numbers have averages of 92.5 and 72.5, respectively. The ninth number exceed...
The mean of a set of 15 numbers is 40. If the mean of the initial 5 numbers in this set is represented by the expression (12x + 10), and the mean of the...
Average 20 numbers is ‘x’. If the average of first 12 numbers is 74.5 while average of last 5 numbers is 84.8 and 13th, 14th a...
3 years ago, the average age of a family of 5 members was 17 years. A baby being born, the average age of the family is 17 years. The present age of the...
The average weight of 4 persons is 35 kg. The heaviest person’s weight is 24 kg more than the lightest person’s weight. If the average weight of the...
The average of ten positive numbers is calculated as 56. On observing, it was found that two numbers 64 and 32 are wrongly interpreted as 76 and 52, res...
60% of 3840 +? + 30% of 4380 = 40% of 8340 + 10% of 3480
The average height of each student in a class of 36 students is 169 cm. If 4 new students joined the class, then the average height of the each student ...
The average age of a group of 20 students is 40 years. Two persons of age 44 years and 33 years, left the group and 2 persons of age 45 years and...
In a classroom, the combined average age of all students and their teacher is 17 years. The average age of the boys in the class is 13 years. If the tea...
