Carcass wrote:
gagangm wrote:
Let's say boys be B and girls be as G.
Avg. Weight formula
65 = [71*B + 62*G]/[B + G]
65(B + G) = 71*B + 62*G
3G = 6B
G = 2B
Doesn't this mean 1 girl is equal to 2 boys?
Yes. For a total of three persons.
One female and two males
This is not correct.
B = number of boys
G = number of girls
G = 2B tells us that the number of girls is equal to TWICE the number of boys.
We can also verify this by finding values of B and G that satisfy the equation G = 2B
For example, G = 10 and B = 5 satisfies the equation G = 2B (notice that the number of girls is twice the number of boys)
Another way to avoid misreading G = 2B is to rewrite it in ratio form.
Take: G = 2B
Divide both sides by B to get: G/B = 2
This is the same as: G/B = 2/1
Or we can write: G:B = 2:1
This tells us that there are two girls for every one boy (i.e., the number of girls is twice the number of boys)