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primary 6 | Maths | Algebra
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Sarah
Sarah

primary 6 chevron_right Maths chevron_right Algebra chevron_right Singapore

Don’t think it’s algebra though? Can help solve this question? Thank you

Date Posted: 1 year ago
Views: 337
Marcus Tan
Marcus Tan
1 year ago
You can use algebra to solve this question. Here's how:

Let the number of rows (before adding more chairs) be x.
Then the total number of chairs in the hall is 30 x.

After adding 24 more chairs,

Total number of chairs = 30 x + 24
Total number of rows = x + 7

Since there are now 27 chairs in each row,
Total number of chairs = 27 × (x + 7)
= 27 x + 189

Note that 27 x + 189 = 30 x + 24.
(subtract 27 x from both sides)

189 = 3 x + 24
(subtracat 24 from both sides)
165 = 3 x

x = 165 ÷ 3 = 55

Total no. of chairs at first = 55 × 30
= 1650 chairs

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