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Question

4/5 of the spectators at a stadium were adults. 75% of the children at the stadium were boys. There were 36 more boys than girls.

(a) How many boys were there at the stadium ?   (b) Some boys left the stadium and after which 10% of the remaining people at the stadium were boys. How many boys left the stadium ?

Answer

         A  :  C  :  Total             B  :  G  :  Total C

          4  :  1  :  5                     3  :  1  :  4

     ×4 |  :  |×4

         16  :  4

3u – 1u = 2u

2u = 36

1u = 36÷2

      = 18

a) number of boys = 3u

                                   = 3×18

                                   = 54

     Total A + C = 20u

                          = 360

      A +G  :  B  :  Total

      16+1  :  3  

         17   :   3

×9    153 :    27   180

          |     -?|     

          9     :    1       

×17  153  :   17

180u = 360

1u = 2

b) Boys left = 27u – 17u

                  = 10u

                  = 10 × 2

                  = 20 ( ans)

 

1 Reply 1 Like

My DS has written different answer for question b. can you pl. check.

1 Reply 0 Likes

Hi, checked through. Your DS is correct 😊! 

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