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Maths Puzzle
Numerical Ability
a nurse has 1 liter of solution that is 20% alcohol. How much pure alcohol must she add to bring the solution up to a 25% concentration?
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One number is two times another. Eight times the smaller is two more than twice the larger number. What are the two numbers?
I need HELP!
1. 6 = 2y - y + 4 4. 3(7 - 11) = y - 5
2. 4 - 9 = a - 1 + 14
3. -23 + 8 + x = -2 + 13