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ഒരു ക്ലാസിലെ 10 കുട്ടികളുടെ വയസ്സുകളുടെ തുക 150 ആണ്. 4 വർഷങ്ങൾക്കു മുമ്പ്ഇവരുടെ വയസ്സുകളുടെ ശരാശരി എത്ര ആയിരുന്നു ? .

A12

B15

C11

D10

Answer:

C. 11

Read Explanation:

To find the average age 4 years ago:

Step 1: Calculate the current average age

Sum of ages = 150
Number of students = 10
Current average age = Sum of ages / Number of students
= 150 / 10
= 15

Step 2: Calculate the average age 4 years ago

Average age 4 years ago = Current average age - 4
= 15 - 4
= 11

So, the average age of the students 4 years ago was:

11


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