A master baker can decorate a cake in 6 minutes and a student baker can decorate the same cake in 12 minutes. If they work together on one cake for one min what part of the cake is left to decorate

3/4

Step-by-step explanation:

so if it takes the master baker 6 minutes and they work on the cake for one minute that is 1/6 if it takes the student 12 minutes that is 1/12. so you do

1/12 x 1/6 and you find the LCD so that is 1x2/6x2 which makes 2/12 + 1/12 = 3/12 and you simplify by dividing the top and bottom by 3  which is 1/4 so if they decorated 1/4 of the cake that leaves 3/4 of the cake left.