The average age of 5 girls is 7 The oldest among them is 15 years old What is the average

(g1+g2+g3+g4+g5)/5=7
g1+g2+g3+g4+g5=35
one of the girl having age 15
g1+g2+g3+g4=20
avg of rest of the girls
(g1+g2+g3+g4)/4=20/4
=5
10 years agoHelpfull: Yes(6) No(2)
Let total 5 girls age is x.
Then x/5=7
then x=35.
so in the 5 girls, oldest one among them is 15 years old.

So from total 35 we need to decrease 15 in order to find remaind 4 girls average.
So 35-15=20
So 4 girls average is 20/4=5.
So the average age of others is 5
10 years agoHelpfull: Yes(6) No(0)
so simple....

ans: 5
10 years agoHelpfull: Yes(0) No(0)
Let the other four girls ages be x, x, x, x
(15+x+x+x+x)/7= 35
X = 5
10 years agoHelpfull: Yes(0) No(0)
average of 5 students including the elder one is 7. i.e
(15+4x)/5 = 7
By solving this we will get the average age as 5 yrs
10 years agoHelpfull: Yes(0) No(0)
5
5*7-4*x=15
x=5
10 years agoHelpfull: Yes(0) No(0)
average 0f 5 girls=7
oldest girl age is 15
5*7=35 oldest=15
total age of 4 girls 35-15=20
20/4=5
9 years agoHelpfull: Yes(0) No(0)

The average age of 5 girls is 7. The oldest among them is 15 years old. What is the average age of others?