Answer:
Ice Cream is 155 calories
Cake is 445 calories
Explanation:
Step 1: Make an equation
3c - 20 = p
p + c = 500
Step 2: Solve the system of equations
p = 3c - 20
3c - 20 + c = 620
4c - 20 + 20 = 620 + 20
4c / 4 = 620 / 4
c = 155
p = 3(155) - 20
p = 465 - 20
p = 445
Ice Cream is 155 calories
Cake is 445 calories