exam Maths Puzzle Numerical Ability

prove that a number and its cube leave the same remainder when divided by 6.

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PLEASE help!
Lisa is coloring. The BLUE color used is 50% of the green color used, YELLOW is %5 of the blue color used, and brown is 7% of the amount of green used. She wants to f 1.2x+4.3=2.1-x