Primary 5 Maths Problem Sum.

• LadyHammy

  16 Jun 10, 23:18

  Hi Earthlings . 

  I hope there are people out there who can help me by solving this mathematics problem sum. 

  There were 7/9 as many men s women in a ballroom . After 18 men and 18 women left the ballroom , there were 5/9 as many men as women left .

  How many women were there in the ballroom at first ?

   Thank you: )

• Forbiddensinner

  17 Jun 10, 00:39

  Originally posted by LadyHammy:

  Hi Earthlings . 

  I hope there are people out there who can help me by solving this mathematics problem sum. 

  There were 7/9 as many men s women in a ballroom . After 18 men and 18 women left the ballroom , there were 5/9 as many men as women left .

  How many women were there in the ballroom at first ?

   Thank you: )

  Currently, we have:

  Men        l__l__l__l__l__l

  Women  l__l__l__l__l__l__l__l__l__l

  In short, 5 units of men to 9 units of women.

  Originally, the ratio of men to women is 7 to 9.

  Hence, (5 units + 18) / (9 units + 18) = 7/9

  Rearranging, we have:

  45 units + 162 = 63 units + 126

  18 units = 36

  1 unit = 2

  Original amount of women

  = 9 units + 18

  = 9(2) + 18

  = 18 + 18

  = 36 women

   

• LadyHammy

  17 Jun 10, 12:52

  Thank you forbiddensinner.