Book Maths Puzzle Percentage

I need to know what degrees these would be, im making a pie chart..

33.3% ,30% ,13.3% ,23.3%

or just tell me how to do it - I thought you multiply by 360 and move the decimal 2

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Book Other Question

Solve
3x-2y-6z=-4
-3x+2y+6z= 1
x- y -5z=-3
A scooter designer uses the same body to make scooters with 3 wheels and scooters with 4 wheels. He has enough bodies to make 50 scooters. He has 160 wheels. How many 3 wheel an