The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is
45
50
55
60
Answer: Option A
Similar Questions :
1. The average of four consecutive odd numbers is 24. Find the largest number.
25
27
29
31
Answer: Option B
Explanation:
Let the numbers are x, x+2, x+4, x+6, then
\begin{aligned}
=> \frac{x+(x+2)+(x+4)+(x+6)}{4} = 24
\end{aligned}
\begin{aligned}
=> x+3 = 24 => x = 21
\end{aligned}
So largest number is 21 + 6 = 27
2. Marks of a student were wrongly entered in computer as 83, actual marks of that student were 63. Due to this mistake average marks of whole class got increased by half (1/2). Find the total number of students in that class.
25
30
35
40
45
Answer: Option D
Explanation:
Suppose total number of students are = X \begin{aligned} Total increase = x*\frac{1}{2} = \frac{x}{2} \\ => \frac{x}{2} = 83-63 = 20 \\ => x = 40 \end{aligned}
3. Average age of boys in a class is 16 years and average age of girls is 15 years, what is the average age of all
15.5
15
16
Cant be computed
Answer: Option D
Explanation:
As number of girls and boys is not given so result cant be computed
4. Average of 10 numbers is zero. At most how many numbers may be greater than zero
0
1
5
9
Answer: Option D
5. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is