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primary 6 | Maths | Algebra
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primary 6 Maths Algebra Singapore

Pls help answer

Date Posted: 5 years ago

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Snell

5 years ago

girls: u [ = 1 unit ]
o avg = 60
o total = 60 x u = 60u

new total = 60u + 165
new avg = 65
new total = 65x(u+2) = 65u + 130

60u + 165 = 65u + 130
u = 7

7 girls

...

Kaushik

5 years ago

Thanks

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Average balloons became 65 after 2 boys join in.
Average balloon for 2 boy = 2×65 =130

The different from total 2 boys sold to average = 165-130=35

The average for all boys and girls different = 65-60=5

Number of girls for the group = 35÷5 =7 girls.

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Date Posted: 5 years ago

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Kaushik

5 years ago

Thanks

Kaushik

5 years ago

Thanks

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