exam
Maths Puzzle
Numerical Ability
21. 3x+5y=15
23. -4x+3y=12
25. x-7y=3 I am not sure how to solve with 2 variables. please help me!!!
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exam Other Question
A chemist is making a solution that is to be 55% chlorine. He has one solution that is 40% chlorine and another that is 65% chlorine. He wants 100 liters of the final solution. How much of each should he mix?
factorise 20ax-15ay-4bx-3by