Math, asked by mohammadFirdosh, 1 year ago

the average weight of 12 people is increased by 3 years when a person of 25 years replaced by a new man. find the age of the new man

Answers

Answered by mahmoudsallam
1

Answer:

86 years

Step-by-step explanation:

Before replacing we have:

average_age = sum_of_ages / 12

or sum_of_ages  = 12* average_age

or sum_of_ages_of_11_persons + 25 = 12* average_age (eq1)

After Replacing we have:

new_average_age = average_age +3

average_age +3  = (sum_of_ages_of_11_people  + X) / 12

or 12*average_age  + 3 * 12 = sum_of_ages_of_11_people  + X (eq2)

Solving the two equations:

Subtracting eq2 from eq1 :

3 * 12 = -25  + X

X = 3*12+25 = 61 years.



mohammadFirdosh: answer 61 try tell me I don't no problem
mahmoudsallam: Edited , mistake: added extra 25 in eq2
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