Self Maths Puzzle Logical Reasoning

You have 2 candles. Every candle lights for 60 minutes. You have to find the way to measure 45 minutes.

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Self Other Question

6+9+3+=711542,
8+5+6=551972,
9+4+7=511790,
7+5+9=?
please slove it as early as possible
x^1/2 + y = 7
x + y^1/2 = 11

prove that x = 9 and y = 4