exam Maths Puzzle Numerical Ability

If y varies as x and y=100 when x=10 and z=5, find y when x=12 and z=6.

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exam Other Question

Find the quotient and remainder when x^3 - 2x^2 + 3x - 4 is divided by x-3 faxtor: 12w2+10w-8
factor 4k2+20k+25
factor: 16e2-4
factor: 3a2+9a+6

thank you for your help