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primary 6 | Maths | Ratio
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Khairin
Khairin

primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

Please help.Thanks

Date Posted: 5 years ago
Views: 246
J
J
5 years ago
Before adding, mass of alloy = 36g - 12g = 24g

Since ratio of copper to zinc = 2 : 3 ,

Total = 5 parts

24g = 5 parts
1 part = 24g ÷ 5 = 4.8g

Mass of copper = 2 parts = 2 x 4.8g = 9.6g

New mass of zinc = 3 parts + 12g
= 3 x 4.8g + 12g
= 14.4g + 12g
= 26.4g

26.4 ÷ 9.6 = 2.75 = 2¾ = 11/4

New ratio of mass of copper to zinc

= 4 : 11

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Lathish
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