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Answer:
The answer is 19 - 4, because of PEMDAS.
- Parentheses
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Any expression wrapped in parentheses always comes first. Whether the sky is pink or blue, parentheses still come first.
Whatever% of anything is just (whatever/100) * anything.
thus, what is 80% of M, well is just (80/100) * M,
what is 50% of N? well is just (50/100) * N.
we know they're both equal, thus
thus, what is 80% of M, well is just (80/100) * M,
what is 50% of N? well is just (50/100) * N.
we know they're both equal, thus