exam
Maths Puzzle
Numerical Ability
x/4 - y/11 = -9/44
x/6 - y/13 = -1/26
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exam Other Question
A barrel contains 30 gallons of 40% antifreeze. How many gallons of an 80% antifreeze solution should be added to make the barrel contain 50% antifreeze?
factoring a quadratic with leading coefficient greater than one
2y^2+15y+28