So you have 20% of blue and 50% of black. So you have 70% in total that are both blue and black. 100%- 70%= 30% So that means 30% were neither blue or black. Do a proportion 30/100= x/30 30 x 30= 900 900 divided by 100= 9 Answer is 9 shirts are neither blue or black
9 times 5 = 45 thats the bases area so now use 9 and 5 to multiply 6.5 in which gets the volume answer wich is 292.5 you are welcome please mark me as brainliest