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## Question

primary 5 | Maths
| Percentage

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Hello all, apart from guess and check, is there any better method to solve this problem? Thank you in advance!

Let number of people = u

3u + 42 = 8u - 47

5u = 89

1u = 89/5

But the answer for this question no valid. Question wrong.... ;(

The extra 89 pencils decide how many students there are in the class.

Number of students = 89/5

= “17.8”

Other than the fact that the question seems flawed, this is the technique to solve such questions.

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