state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Average

The Average age of a class of 15 students is 20 years. One student of age 25 years left the class and a new student of age 10 years joined the class. What is the new average of the class?

1
20 yrs
2
19 yrs
3
21 yrs
4
18 yrs
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