exam Maths Puzzle Numerical Ability

How do you solve this problem, there are two consecutive odd numbers when multiplied equal the product 323. What are the two numbers?

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exam Other Question

Commercial airliners fly from NY to Paris 5 times as fast, or 400 miles/hour
faster than the Lindbergh's plane.
A. at what speed did Lindberghs plane fly?
B. At what speed do co How many liters of an 11% alcohol solution should be mixed with 60 liters of a 5% alcohol solution to obtain a mixture that is 7% alcohol?