Interview Maths Puzzle Logical Reasoning

what is the odd man out of 3,5,11,14,17,21...?

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Interview Other Question

Linda wants to drain the water out of an open top 55 gallon rain barrel. She has the choice of using either a 2-inch diameter hose, two 1-inch diameter hoses or 4 1/2 inch diameter hoses.
Which hose size will drain the barrel faster? Will they drain equally as fast?
The ratio of the number of gents to ladies in a party was 2:3. When 20 more gents joined the group, the ratio was reversed. The number of ladies in the party was