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by sanju09 » Sat May 08, 2010 3:16 am
maheshban 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.
Plain math work

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]
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by shashank.ism » Sat May 08, 2010 5:16 am
maheshban 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.
Let initially there are 2X boys and 5X girls.
so (2X+ 12) /5X = 4/9 --> 18X+108 = 20X --> X=54
so current no. of boys = 2X=108 Ans E
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