Homework Help: math

Posted by lomas on Thursday, October 21, 2010 at 9:19pm.

there are 4 girls in Mrs. Changs class than Mr. Blackwell's.

5 girls moved from Mrs. Changs to Mr. Blackwells.

Now there are twice as many girls in Mr. Blackwells class as there are in Mrs. Changs, How many girls were in Mr. Blackwells class to begin with?

Help, stuck with this problem.

math - Reiny, Thursday, October 21, 2010 at 9:34pm
retype the first sentence, it makes no sense and must contain a typo ....

probably "4 more girls" or "4 less girls"
math - lomas, Thursday, October 21, 2010 at 9:36pm
sorry. it's 4 more girls
math - Reiny, Thursday, October 21, 2010 at 9:44pm
make a chart:
Now....
Mr Blackwell --- x students
Mrs Chang ---- x+4

after move:
Mr. B ---- x+5
Mrs. C ---- x-1

x+5 = 2(x-1)
x+5 = 2x - 2
x = 7

so Mr B had 7, Mrs C had 11

(Wow! 7 students and 11 students, where do these schools exist ???? I might go back to teaching)
math - lomas, Thursday, October 21, 2010 at 9:51pm
thank you.

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