There are 10 children in a room. The ratio of boys to girls increased when another boy and another girl entered the room. What is the greatest number of boys that could originally have been in the room?

Question

anonymous · Answer

Answer choices: A) 1 B) 4 C) 5 D) 9 E) 10

anonymous · Answer

B is the correct answer!

anonymous · Answer

Why?

anonymous · Answer

b=no. of boys(intially)..so (10-b)..becomes no. of girls..then..the raito is b/(10-b)...then after addition of a boy and a gilr the no. of boys becomes (b+1) and girls becomes (12-b-1)=(11-b)...so we'v got later raito as..(b+1)/(11-b)..then..i proceeded with hit and trial method!..

anonymous · Answer

whn we use 5 as no. of boys.thelater ratio becomes greater than the intial so..5 is the correct answer!