book Maths Puzzle Numerical Ability

Finding supplementary and complementary angles.
How can 174 degrees have a complementary angle?

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book Other Question

[52.4-(16.1/3.6] - 30.2

I don't get how to do this. / means divide The angular velocity of a merry-go-round is 35 radians/minute. If the diameter is 38 feet, find the linear velocity of a person standing on the very edge of the merry-go-round.