Answers

2016-01-27T18:50:43+08:00
An example of a problem regarding partitive proportion.

x = cement
3x = sand
4x = gravel

1x + 3x + 4x = 160\\
8x = 160\\
 \frac{8x}{8} = \frac{160}{8} \\ x = 20
x = 20 - cement
3x = 3(20) = 60 - sand
4x = 4(20) = 80 - gravel

Therefore, the answer to your question are 60 kg. for sand, and 80 kg. for gravel.



20 + 60 + 80 = 160
1 : 3 : 4 = 20 : 60 : 80


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