exam
Maths Puzzle
Numerical Ability
How many gallons of pure alcohol should be mixed with 20 gal of a 15% alcohol solution to obtain a mixture that is 25% alcohol?
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exam Other Question
solve each system of equations by using either substitution or elimination.
2x-y=-5
4x+y=2
A service station wishes to mix 40 L of a 78% antifreeze solution. How many litres of a 75% solution and a 90% solution should be used in forming the mixture? ( using two unknowns, write two equations and solve.)