Nicole is making tuna salad for her office colleagues. It takes pound of canned tuna to make 5 portions of saladShe uses 2/5 1 1/5 pounds of canned tuna for every 2 onions used Nicole uses a total of 4 onions, then how many portions of salad does she make? please help fast !

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.