book Maths Puzzle Numerical Ability

how many liters of 12% salt solution must be added to 10 liters of 25% salt solution to get a 20% salt solution

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book Other Question

What is the Fahrenheit temperture when converting this Celsisu formula

F=9/5C + 32
Describe a first step for solving each system using elimination. Then solve each system.

2x-y=6
-3x+4y=1