At a zoo there are three times as many cats as crocodiles, and five times as many koalas as cats. The ratio of koalas to cobras is $$\(9: 4\)$$. What is the ratio of cobras to crocodiles?
A.
\(4: 3\)
B.
\(20: 3\)
C.
\(45: 4\)
D.
\(135: 4\)
Exam No：2020 First Round Grade 7 Year：2020 Question No：18
Answer:
B
Knowledge points:
G7 - Algebra - Simple Systems of Equations (Logic & Substitution)
Solution:
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