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Question

Hi, please help to solve this problem. Thanks. 

Answer

100B + 100G = 210 e1

120B = 90G e2

e2 x 5,

600B = 450G

e1 x 6,

600B + 600G = 1260

450G + 600G = 1260

1050G = 1260

1G = 1260/1050 = 1.2

90G = 1.2 x 90 = 108

108 x 2 = 216 ans

 

 

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  Number of boys Number of girls Total
Year 1 100B 100G 210
Year 2 +20% -10%  
  120B 90G  

In Year 2, there are equal number of boys and girls

120B = 90G

100B = (90G ÷ 120) × 100 = 75G

 

In Year 1,

100B + 100G = 210

75G + 100G = 210

175G = 210

 

90G = (210 ÷ 175) × 90 = 108

In Year 2, number of students -> 108 × 2 = 216

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A bit confused. Any different solution?

Thank you.

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