book Maths Puzzle Numerical Ability

(+36)divided by (-6)= the answers are.....-6, 6, 30, or -30

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book Other Question

A public safety department for a local community employs 23 officers of which 5 are sergeants. Due to the size of the community, 3 of the officers on duty at any given time must b If Cos A = 3/5 and A is in the first quadrant, find cos 2A.