Question
The average age of a class of 21 boys is 14year 3month.if the oldest boy is not counted in.the average drops to 14years 2month,how old is he???
Answers
Steve
If the oldest boy's age is x, then
(14 3/12)*21 = (14 2/12)*20+x
x = 15 11/12
(14 3/12)*21 = (14 2/12)*20+x
x = 15 11/12
Collins
Eh? I don,t understand ur write up
Reiny
Restating what Steve said in a slightly different way:
sum of ages of all 21 boys = 21(14 3/12) = 299 1/4
sum of ages without oldest = 20(14 2/12) = 283 1/3
age of boy not included (oldest)
= 299 1/4 - 283 1/3
= 15 11/12
which is exactly what Steve did
sum of ages of all 21 boys = 21(14 3/12) = 299 1/4
sum of ages without oldest = 20(14 2/12) = 283 1/3
age of boy not included (oldest)
= 299 1/4 - 283 1/3
= 15 11/12
which is exactly what Steve did
Esther
I dont understand
Misan
I don't understand