the avaraeage of the boy's in a class of 20 boys is 15.6 year .what will be the Avarege age if 5 new boys come whose avarage age is15.4year.
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Let the sum of age of 20 boys be y.
Therefore, y/20 = 15.6
then y = 15.6×20 = 312
Now, let the sum of age of 5 boys be z.
Therefore, z/5 = 15.4
then z = 15.4×5 = 77
Sum of age of total no. of boys that's 25 = 312 + 77= 389
New average age of the whole class = 389/25 = 15.56 years
Tell me if that helps ☺
Therefore, y/20 = 15.6
then y = 15.6×20 = 312
Now, let the sum of age of 5 boys be z.
Therefore, z/5 = 15.4
then z = 15.4×5 = 77
Sum of age of total no. of boys that's 25 = 312 + 77= 389
New average age of the whole class = 389/25 = 15.56 years
Tell me if that helps ☺
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