Plain math workmaheshban wrote:The current ratio of boys and girls at a certain school is 2 to 5 .If 12 additional boys were added to the school ,the new ratio of boys to girls would be 4 to 9.How many boys are currently attending the school?
A.27
B.48
c.54
d.72
e.108.
Take g = 5 b/2 from the first line of stem, and put the same in the second line of stem, which is (b + 12)/g = 4/9.
Now, have 9 (b + 12) = 10 b, or [spoiler]b = 108[/spoiler].
[spoiler]E[/spoiler]
