There are 6 boys and 2 girls in a room. The mean of all their ages is 15. The mean of the girl's ages is 16.5. Work out the mean of the boys ages

Question

blurbendy · Answer

Two equations
(6B + 2G) / 8 = 15 GIVEN
8 * 15 = 120 
^ 8 because 6 boys + 2 girls = 8 and 15 because the mean is 15

2G/2 = 16.5 
G = 16.5 GIVEN

6B + 2 * 16.5 = 120 
6B + 33 = 120 
6B = 87 
B = 14.5

anonymous · Answer

what does 6B+33 mean @blurbendy

blurbendy · Answer

B is a variable.  we dont know the mean age of the boys, so that is what B is trying to find.  33 because we know G = 16.5

2 girls * 16.5 = 33

anonymous · Answer

whats the total of boys ages looking at this @blurbendy

blurbendy · Answer

14.5 * 6