Question

In a zoo, tiger and ostrich were counted. If heads were counted, there are 400 and if legs are counted there were 820. How many ostrich are there?

A 240 Correct Answer Incorrect Answer
B 310 Correct Answer Incorrect Answer
C 165 Correct Answer Incorrect Answer
D 390 Correct Answer Incorrect Answer

Solution

By allegation rule Average number of legs per head = `520/400` =`31/20` Tiger : Ostrich = 1 : 39 Number of ostrich = `400/40xx` 39 = 390

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