Answer:
Mark could make 30 cakes.
Step-by-step explanation:
To find this, first find the amount of cakes he can make in one day. You can find this by dividing the number of cakes by the number of days.
42 cakes/7 days = 6 cakes per day
Now multiply this by the new number of days.
6 cakes per day * 5 days = 30 cakes