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You can click here and read the posting A family in Singapore about Sarin’s family.
Read also the posting on Sarin learns the concept of Ratio in School (mathematics concept) to understand the concept of Ratio.
Challenge yourself with the question before look for the given solution‼!
Upper primary school mathematics question UPQ480
The ratio of the mass of Sarin to the mass of Fatimah is 5 : 3. The ratio of the mass of Hairu to the mass of Fatimah is 5 : 4. Hairu weighs 30 kg, what is the mass of Sarin?
Draw the math model,
The ratio of Hairu’s mass to Fatimah’s mass is 5 : 4
5 units = 30
1 unit = 6 kg
The mass of Fatimah = 4 × 6 = 24 kg
The ratio of Sarin’s mass to Fatimah’s mass is 5 : 3
3 units = 24
1 unit = 8 kg
The mass of Sarin = 5 × 8 = 40 kg
The mass ratio,
Sarin : Fatimah = 5 : 3 = 20 : 12
Hairu : Fatimah = 5 : 4 = 15 : 12
Sarin : Fatimah : Hairu = 20 : 12 : 15
The weigh of Hairu is 30kg
15 units = 30
1 unit = 2kg
The mass of Sarin = 20 × 2 = 40 kg