Question
The average of three numbers is 45. The first number is
thrice the second. And the second number is twice the third find the difference between the first number and second number.Solution
The correct answer is C
Find the mean of the following observations:
45, 54, 42, 56, 46, 48, 52, 50, 57, 43Average marks of 30 students is 76. Two new students with marks (y + 8) and (y - 12) join, and the average becomes 75. Find (y - 35).
The average age of 15 children and their teacher's age are 12 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age?
The base of a right pyramid is a square of side 10 cm. If its height is 10 cm. then the area (in cm2) of its lateral surface is:
The average number of books on history, polity and geography in a library is 165, and the average number of books on history and geography is 140. If th...
Bag A and Bag B contain balls in the ratio of 7:6, while Bag B and Bag C have balls in the ratio of 2:3. If the average number of balls across all three...
The average age of a class of 25 girls is 20 years. If 7 new girls having average age of 12 years join the class, then the average age of the class beco...
In an examination, the average marks obtained by the students is 80. After correcting the quantitative mistakes, the average of 90 students is reduced t...
The average of five consecutive natural numbers is 14. What will be the average of the seven numbers if the next two natural numbers are also included?
Rajat aims to save an average of Rs. 750 per month over the course of a year. For the first 8 months, his monthly income was Rs. 3,000, and he spent 80%...
