SSC CHSL MATHS QUIZ

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Question 1:

The average of 19 numbers is 58 . The average of the first 12 numbers is $63.6$ and the average of the last 8 numbers is $55.1$. If the 12 th number from the beginning is excluded, then what is the average of the remaining numbers?

Question 2:

The average age of $66 \frac{2}{3} \%$ of the number of children in a group is 13 years. The average age of all the children in the group is $14.5$ years. What is the average age (in years) of the remaining children?

Question 3:

The average of eleven consecutive positive integers is d. If the last two numbers are excluded, by how much will the average increase or decrease?

Question 4:

The average weight of 15 students in a class increase by $1.5 \mathrm{~kg}$ when one of the students weighting $45 \mathrm{~kg}$ is replaced by a new student. What is the weight (in $\mathrm{kg}$ ) of the new student?

Question 5:

The average of 14 numbers is $73.5$. If two numbers 60 and 63 are replaced by 58 and 70 and one more number $x$ is included, then the average of the numbers now increases by $1.5$. What is the value of $x$ ?

Question 6:

A shopkeeper blends two varieties of tea, one costing ₹ 320 per kg and another costing ₹ 240 per kg, in the ratio 9 : 11. If he sells the mixture at ₹ 325.68 per kg, then his gain percentage is:

Question 7:

The average age of the boys participating in a camp is 16 years and that of the girls is 13 years. If the ratio of the number of boys and girls participating in the camp is $2: 3$, then what is the average age (in years) of all the participants?

Question 8:

The average of nine numbers is $20.6$. The average of three of them is $26.1$, while the average of the other three numbers is $15.2$. What will be the average of the remaining three numbers?

Question 9:

The average salary of all the employees in a workshop is ₹ 18,000. The average salary of 7 technicians is ₹ 24,000 and that of the remaining employees is ₹ 12,000. What is the total number of employees in the workshop?

Question 10:

The average weight of 24 persons in a group is 72 kg. If 3 persons with average weight 78 kg leave the group and 4 persons of average weight 75 kg join the group, then what will be the average weight (in kg ) of the persons in the group now?