Question

04. The ages of three children are in the ratio of seven, eight and nine respectively. If the
age of the eldest one is 18 years, what will be their average age ?
(a) 15 years (b) 16 years (c) 14 years (d) 13 years​

Answer 1

Answer:

16 years

Step-by-step explanation:

let the ages be 7x, 8x, 9x

here eldest is 9x

so,

9x=18

x=2years

Method 1:

age of 1st = 7x = 14 years

age of 2nd = 8x = 16 years

average = sum/number of people

average = (14+16+18)/3

=48/3

=16years(b)

Method 2:

average =(7x+8x+9x)/3

=24x/3

=8x

=16 years

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