alleryA concrete mix is cement : sand : gravel = 1:2:4. What is the ratio of sand to gravel in simplest form?
A1:4
B4:2
C1:2
D2:1
Answer & Solution
Correct answer: C. 1:2
1. In a ratio with more than two terms, any two terms form a ratio too.
2. Sand to gravel is 2:4.
3. Dividing both by 2 gives 1:2; 1:4 wrongly uses cement.
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