Tess is a hairdresser. Before her lunch break, she gave 1 haircut and colored the hair of 1 client in 72 minutes. After lunch, she colored the hair of 1 client in 55 minutes. How long does it take for Tess to perform each type of service, assuming the amount of time doesn't vary from client to client?
Let hair cut be X and hair colouration be Y , using the question X+Y = 72 "colored the hair of 1 client in 55 minutes" , 1Y Y = 55X = 72-55 = 17 Tess takes 17mins to perform a haircut and 55 minutes to colour a hair.