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The average age of a group of 10 students was 15 years. When 5 more students joined the group, the average age rose by 1 year. The average age (in years) of new students was

 
18 years
20 years
16 years
15 years
21 years

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18

(X1+X2+----------+X10)/10 = 15, (X1+X2+--------------+X10)=150 (X1+X2+-----------+X10+X11+-----X15)/15=16 (X1+X2+-----------+X10+X11+-----X15)=16*15=240 X11+X12+----X15=240-150=90 Average age of new students = 90/5=18 years (Answer)

18