Question 21
Sam, Tom and Una are chefs in a restaurant. Today, they cooked a total of 320 plates of spaghetti, where Sam cooked for 6 hours, Tom for 8 hours and Una for 5 hours. They also cooked spaghetti at different speeds with Sam cooking 5 plates for every 3 that Tom cooked and for every 2 that Una cooked. How many plates of spaghetti did Sam cook this day?