book Maths Puzzle Numerical Ability

How do you figure out that a angle is supplementary?

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book Other Question

Mrs. Windell spent 1 h addressing one-third of the family Christmas cards, and Mr. Windell spent 1 1/4 h addressing another third. Continuing the addressing together, how long did Find all values of w satisfying the equation:

3w/w - 2 = negative 27/w^2 - 8w + 12