SSC Government Jobs Exams Numerical Ability Averages

The average age of 30 kids is 9 years. If the teacher's age is included, the average age becomes 10 years. What is the teacher's age?

Read Solution (Total 2)

teacher age 40
11 years agoHelpfull: Yes(0) No(0)

10+1*30=40
5 years agoHelpfull: Yes(0) No(0)

SSC Other Question

A mixture of 40 litres of milk contains 20% of water. How much water must beadded to make the water 25% in the new mixture? The average of 6 numbers is 8. What is the 7th number, so that the average becomes 10?