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The average age of 3girls is 17 years 4 months. The average age of 2 of them is 17years 3 months, how old is the third girl |
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Answer» 17 years 6 monthsStep-by-step EXPLANATION:LET the required age be 'x' Now, the average of the 3 girls' ages is 17 yrs 4 months = 208 months = x + (sum of ages of other girls) / 3 = 208 - (1)Also, the average of the other girls' ages is 17 yrs 3 months = 207 months = (sum of ages of other girls) / 2 = 207 => sum of ages of other girls = 414Now back to first eqn. (1) = x +414 / 3 = 208 => x + 414 = 624 x = 624-414 = 210 months = 17 yrs 6 months |
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