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Question

Good morning. Could anyone help me out with this question please? Thank you 🙏 

Edit: I managed to get the answer 357 by doing Guess & Check but doubt it’s an acceptable method. Hope the Shifus here can advise on the appropriate method to solve this. Thank you very much.

Source: Haig Girls’

Answer

Total number of chairs for additional 12 rows –> 12 x 7 = 84

Number of chairs taken from existing rows –> 84 – 6 = 78

2 chairs were taken from each existing rows.

Number of existing rows –> 78 / 2 = 39

Total number of rows now –> 39 + 12 = 51

Total number of chairs now –> 51 x 7 = 357

 

There are 357 chairs in the hall for the concert.

1 Reply 1 Like ✔Accepted Answer

Thank u Priskhipo

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This is a Quantity Each Product question. 

  Quantity Each  Product 
Before 1u 9 9u
After 1u + 12 7 7u + 84
       

7u + 84 = 9u + 6

84 – 6 = 9u – 7u

2u = 78

1u = 78 ÷ 2 = 39

9u = 9 × 39 = 351

351 + 6 = 357 chairs 

1 Reply 1 Like

Thank u Mr Khong

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