The average age of Ina, Mina and Dika is x years, then y years later the average age of them will be _____ years.



Hence, average age of ina, mina and dika, y later will be (x+y) years 

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the total age of Ina, Mina and Dika today is 3x
y years later they would each be y years older
thus their total age after y years would be, 3x + 3y
average = (3x + 3y)/3 = x + y
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