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Average age of students of an adult school is 40 yr. 120 new students whose average age is 32 yr joined the school. As a result the average age is decreased by 4 yr. The number of students of the school after joining of the new student is:
The average age of husband and wife was 22 years when they were married five years back. What is the present average age of the family if they have a three year old child?
A car completes the first half of its journey with a velocity $ v_1 $ and the rest half with a velocity $ v_2 $ . Then, the average velocity of the car for the whole journey is:
The average marks per student in a class of $ 30 $ students were $ 45 $ . On rechecking it was found that marks had been entered wrongly in two cases. After correction these marks were increased by $ 24 $ and $ 34 $ in the two cases. The corrected average marks per student are:
In a certain school, the number of students in each section was $ 24 $ . After admitting some students, three new sections have been started and now there are $ 16 $ sections with $ 21 $ students in each. What is the number of newly admitted students?
The average marks of boys in a class is $ 52 $ and that of girls is $ 42 $ . The average marks of boys and girls combined is $ 50 $ . The percentage of boys in the class is:
Let S be the set of integers x such that i. 100 ≤ x ≤ 200 ii. x is odd and iii. x is divisible by 3 but not by 7 How many elements does S contain?
A set of consecutive positive integers beginning with 1 is written on the blackboard. A student came along and erased one number. The average of the remaining numbers is $ 35\frac{7}{17} $ . What was the number erased?
Three cities A, B and C are equidistant from each other. A motorist travels from A to B at 30 km/hr, from B to C at 40km/hr and from C to A at 50 km/hr. Then the average speed is:
There are 40 female and 20 male students in a class. If the average heights of female and male students are 5.15 feet and 5.66 feet, respectively, then the average height (in feet) of all the students in the class equals:
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