The average age of a group of 15 students is 24 years. If 6 more students join the group, the average age increases by 2 year. The average age of the new students is:

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Solution

The correct option is A 31
Sum of ages of 15 students $= 15 \times 24 = 360$
Sum of ages of students after 6 more joined $= 21 \times 26 = 546$
Sum of ages of new students = 546-360 = 186
Average age of new students $= \frac{186}{6} = 31$ Kg

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The average age of a group of 15 students is 24 years. If 6 more students join the group, the average age increases by 2 year. The average age of the new students is:

The correct option is A 31Sum of ages of 15 students =15×24=360 Sum of ages of students after 6 more joined =21×26=546 Sum of ages of new students = 546-360 = 186 Average age of new students =1866=31 Kg

The correct option is A 31
Sum of ages of 15 students $= 15 \times 24 = 360$
Sum of ages of students after 6 more joined $= 21 \times 26 = 546$
Sum of ages of new students = 546-360 = 186
Average age of new students $= \frac{186}{6} = 31$ Kg