exam
Maths Puzzle
Numerical Ability
how do you do equations please help me
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1. b+17 - 1 = b-2
b²-1 b+1 b-1
2. solve for a 1/a + 1/b = 1/f
3. 5x²-9=2x
rubbing alcohol is typically diluted with water to 70% strength. if you need 3.5 ounces of 45% rubbing alcohol, how many ounces of 70% rubbing alcohol and how much water should you combine?