book Maths Puzzle Numerical Ability

How do you figure out that a angle is supplementary?

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book Other Question

Lois rode her bike to visit a friend. She traveled at 10 mi/h. While she was there, it began to rain. Her friend drove her home in a car traveling at 25 mi/h. Lois took 1.5 h longe What is 0.47 rounded to the nearest tenth?