exam Maths Puzzle Numerical Ability

Triangle ADE ~ triangle ABC

Given: DE = 5, AD = 8, DB = BC
Find: AB
(Hint: Find DB first.)

I need help with the hint. I know that I need to some how set up a proportion

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exam Other Question
Find the exact value of cos(-420º) Can someone help me solve this problem?

I need to evaluate the following problem and need to use the order of operations:
4 - (-3) + 1/2-2 divided by (-2)

Thanks,
Ashley