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Maths Puzzle
Numerical Ability
You need .3 mg You already have 0.2g/300g of powder. How much powder of you need to make that .3mg?
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DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0
x-3y+3z=-4
2x+3y-z=15
4x-3y-z=19