Exam Maths Puzzle Logical Reasoning

can u make the equation correct by using only one straight line
5+5+5=550
note : don't use not equals sign.

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Exam Other Question

A vessel is filled with sulphuric acid, the vessel is in a shape of inverted cone of height 'H'. When the vessel is closed and made it stand upright,
to what height the sulphuric acid is raised to?
How many words, with or without meaning, each of 3 vowels and 2
consonants can be formed from the letters of the word INVOLUTE ?