the average age of 50 students of a class is 20 years average age remains unaltered if 10 students are admitted what is age of 10 new students ? 1. 150, 2. 180, 3. 200 , 4. 220
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50 ------20
60 ------20
10 -------?
sum of 50 =20×50=1000
1000 + 10students =20 ×60 =1200
10students =200 answer
60 ------20
10 -------?
sum of 50 =20×50=1000
1000 + 10students =20 ×60 =1200
10students =200 answer
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